Measurement of the MOOC Phenomenon by Pre-Service Teachers: A Descriptive Case Study

: The main objective of this research is to establish the measurement of pre-service teachers on the MOOC phenomenon, one of the most important manifestations within the processes of on-line education that have emerged under the protection of the digital paradigm. The research methodology used was of an exploratory, qualitative, and descriptive nature. It falls within the generic scope of qualitative research methods of an ethnographic nature through the analysis of learning objects and interventions in the network. The sample ( n = 218) was composed of students from the educational ﬁeld, who took a subject focused on ICT applied to education, over several academic years. Using the edublog as a digital and documentary source, a total of 1962 frequencies were collected referring to the advantages (1052 frequencies) and limitations (910 frequencies) that they determined when carrying out these courses. As main results, it is worth mentioning that pre-service teachers consider MOOC courses valuable as teaching models in socio-educational contexts. They o ﬀ er unquestionable advantages such as free of charge usage, training for disadvantaged groups, ﬂexible hours, etc. However, their disadvantages are also important. For example, it is considered that these courses do not adequately follow up on the student, that the materials they o ﬀ er are not very innovative, or also that the evaluation of the learning is inadequate. It is interesting to note that the main problems identiﬁed are of a pedagogical, not technical, nature.


Introduction
The integration of information and communication technologies (ICT) in training contexts is one of the greatest challenges in higher education today [1][2][3]. The digitization and virtualization of the teaching-learning processes in the university world pose different challenges that must be met [4][5][6][7][8]. The digital paradigm has offered a new educational setting. The existence of multiple interactive and participatory technologies contribute to an individual learning experience but, at the same time, with multiple social connections that in many cases contribute to the motivation and

Background
It is important to point out, however, because it has been so widely studied and tested, that there is little preparation of teachers in Higher Education with regard to ICTs, which would undoubtedly make it difficult to speak of revolutionary teaching methodologies [38][39][40]. Too many myths have been created in recent years about the impact of ICT on education and digital literacy [41]. Of course, the appearance of MOOCs and their rapid dissemination can contribute to improving teacher training, especially from a didactic point of view. Thus, the importance does not lie in the use of new technologies, but in the use of these tools in an appropriate way so that students participate more actively and intensively in their training [42]. That learning, in short, and regardless of the context in which it is found, is the best possible. In this sense, the MOOC phenomenon has not been so innovative [43]. Despite presenting novel features-some of which were only experimental or that were in the process of being implemented-these courses are mainly based on traditional elements and are very simple in their structure. It is true that in order to offer them it is necessary to have a good technological base that allows creating the virtual environments in which they are developed, but globally they do not offer exclusive methodological innovations.
There are doubts about connectivism, one of the characteristics that has been assigned to MOOC courses. Although, among other authors, Siemens [44,45] has defended the benefits that connectivism offers in the educational process, where the interaction that people carry out would acquire greater importance than the content that is taught, there is no reliable demonstration of this fact. On the contrary, it is easy to find positions that affirm that these benefits are not obtained through the interconnection that takes place between the subjects, but rather thanks to the perception that the students have of this educational process [46]. Clará and Barberá [47] consider connectivism too problematic, arguing that they must bet on another type of methodology that is more consistent and adequate. It is common to find opinions both for and against its results [29,[48][49][50], and today it is far from reaching a consensus on this matter. Precisely, the fact that today there are different types of MOOC courses depends, above all, on the connectivist characteristics they present. We can highlight the cMOOC (based on learning in networks based on connectivist postulates), xMOOC (although applied in networks it relies on traditional learning models) and tMOOC, considering the latter as a hybrid model of the previous ones, as it has as a fundamental element the performance of tasks by the student [51][52][53]. However, in practice, there are not many differences in terms of results or research that can demonstrate that these typologies are actually applied based on their theoretical assumptions. Nor really specify the degree of connectivism present in a MOOC course.
However, despite this disappointment on the part of many experts, the development of MOOCs continues to be a booming phenomenon worldwide [11,54]. They emphasize the use of social networks (Facebook, Twitter, etc.) that consolidate these learning communities. In addition to social networks, those involved in the learning community can take advantage of content aggregation (RSS, for example) to share information, thematic or tangential materials, and learning strategies. Its fundamental characteristics are [55]: free training modalities, supported by audiovisual content, without limit of students and use collaborative and participatory methodological strategies. On the other hand, MOOCs are modern teaching-learning resources, with a high potential for the dissemination of knowledge because they are based on social networks [56]. They also expand access to training by offering learning opportunities regardless of affiliation with a particular institution. They are very interesting because they allow anyone to continue training throughout their lives, and it can serve as a way for teachers to promote their professional development. Also, in agreement with García-Sastre, Idrissi, Ortega and Gómez-Sánchez [57], it presents great potential to allow access to higher education to any student for free who has the possibility of accessing the Internet. In addition, they offer multiple advantages at the educational level, such as ubiquity, free, credibility and quality [58]. On the other hand, various authors [59][60][61] describe several of the weaknesses of this training modality, including: high dropout rates; lack of feedback; low interaction; there is no reliable verification of learning outcomes and peer assessments and a wide variety of topics predominate, but without an explicit curriculum. Ultimately, MOOC courses can be considered to be a large-scale, modular and adaptive training solution to changes or new social needs [62]. Likewise, although the evaluation has aroused a great didactic motivation and generated different models and proposals, ranging from questionnaires corrected in an automated way, peer evaluation, or e-portfolios, it is of vital importance to study the level of cognitive competence. In this sense, Dawna, Eleanore, Williams and Brooks [63] carry out pilot studies related to the optimal automatic correction related to this type of evaluative test. Similarly, as indicated by López-Meneses, Vázquez-Cano and Román [64] there is a progressive increase in scientific documents related to this issue worldwide from 2013 to the present. In this sense, as Shah [65] points out, these emerging training trends have become very popular, with thousands of courses produced annually. Ultimately, MOOCs can be considered as new socio-virtual environments for sustainable educational development and can lead to a turning point in the didactic ecosystem of Higher Education [66].

Scenario Research, Sample and Objectives
Although in recent years there have been multiple studies and research on MOOC courses, which have covered practically all its possible dimensions, we consider that there is one of them that should be further explored due to its great interest. By this, we mean understanding better how their main users value them: students. In addition, and although its defining characteristic of open courses makes it possible for anyone of any age to follow them, it is especially relevant for us to establish the assessment made of this phenomenon by Higher Education students and, specifically, in the scenario of future professionals of teaching. That is why we have carried out this research in degrees related to education, after a theoretical presentation and practical experience that students had to carry out by taking MOOC courses.
The study was carried out for five years, from 2015 to 2019, at the Pablo de Olavide University, in Seville (Spain), applied to pre-service teachers students of the subject "ICT in Social Education" (of the Degree in Social Education, 7 ECTS credits, European Credit Transfer System). We consider this subject suitable since it precisely seeks to develop competencies in the field of technologies and innovation management, implementing problem-solving and decision-making skills in training areas. In addition, among the competences to be developed in students is to analyze, understand and develop the possibilities offered by ICT today in the field of social and educational intervention, in addition to reflecting critically on the new demands and forms of social exclusion that presents the knowledge society to the profession of social educator.
In this subject there is a last thematic block called "MOOC courses and their repercussion and impact on the social scene", in which the characteristics of this phenomenon are presented theoretically and later a practical experience will be carried out in which students take different MOOC courses from different platforms and universities. The educational praxis results in the students having to present a metacognitive and reflexive contribution on the positive and negative characteristics of the MOOCs, according to the personal work they have done on them.
For this purpose, each university student designed and implemented an edublog inserting this didactic contribution. Different slogans were offered to carry out the work in the most effective way possible, accompanied by an explanatory video referring to the main characteristics of the MOOC courses that allowed them to identify positive and negative aspects.
Detailing the process, each student had to elaborate a personal edublog, within the subject already referred to and taught by the faculty of the Department of Education and Social Psychology, on the evidence of e-activities carried out during the academic semester. This product, the edublog, was compulsory and was valued with 20% of the final grade. One of its tabs corresponded to the work of analysis on the MOOC in order to determine its advantages/disadvantages in the socio-educational field. This was an after-school activity and was offered as a deadline for presentation one week before the end of the academic year.
In Figure 1, an edublog made by a student of this subject is presented as an example: Educ. Sci. 2020, 10, x FOR PEER REVIEW 5 of 16 In Figure 1, an edublog made by a student of this subject is presented as an example: . The sample consisted of 68.59% women and 31.21% men. The average age was 21.24 years, as all students belonged to the same degree, the same course and studied the same subject. A total of 1052 frequencies were obtained, which highlighted the advantages they considered the MOOC courses offered in relation to other training proposals in the field of Higher Education. On the other hand, 910 frequencies were identified that pointed out the deficiencies, limitations and barriers found when taking these courses. This makes a total of 1962 frequencies. This broad sample offers us a valuable evaluation of what future teachers consider about the MOOC phenomenon.
In general, therefore, the objectives pursued are focused on (1) studying the students' perception of the most relevant positive aspects concerning the new training modalities of MOOCs, and (2) describing the main weaknesses of these courses.

Study Design and Method
The research methodology used was exploratory, qualitative and descriptive. It is part of the generic field of descriptive and ethnographic qualitative research methods through the analysis of learning objects and online interventions. Given the homogeneity of the sample (students of the same age, the same university and degree, and coming globally from a socioeconomic context with similar characteristics (it is a public university)) a specific study of these variables was not necessary.
To analyze the information obtained in the fieldwork, consisting of the dozens of documents prepared by the students (comments on the MOOC courses presented in personal edublogs), the most appropriate guidelines for documentary analysis were used in the context of qualitative methods [67][68][69][70][71][72]. To this end, a simplification of the information was carried out through the selection, grouping, categorization and coding of the collected data. During the coding, each textual unit was identified, analyzed and linked with its corresponding category through a mixed procedure (inductive-deductive). Subsequently, the frequency process began. Finally, the analysis process ended in which the different units of information collected were interpreted to guide the inference and interpretation phase of the results that will be presented.
Focusing on and detailing the analysis carried out, it should be emphasized that we obtained the 1962 frequencies offered by the students from the words or sets of meanings as registration units. . The sample consisted of 68.59% women and 31.21% men. The average age was 21.24 years, as all students belonged to the same degree, the same course and studied the same subject. A total of 1052 frequencies were obtained, which highlighted the advantages they considered the MOOC courses offered in relation to other training proposals in the field of Higher Education. On the other hand, 910 frequencies were identified that pointed out the deficiencies, limitations and barriers found when taking these courses. This makes a total of 1962 frequencies. This broad sample offers us a valuable evaluation of what future teachers consider about the MOOC phenomenon.
In general, therefore, the objectives pursued are focused on (1) studying the students' perception of the most relevant positive aspects concerning the new training modalities of MOOCs, and (2) describing the main weaknesses of these courses.

Study Design and Method
The research methodology used was exploratory, qualitative and descriptive. It is part of the generic field of descriptive and ethnographic qualitative research methods through the analysis of learning objects and online interventions. Given the homogeneity of the sample (students of the same age, the same university and degree, and coming globally from a socioeconomic context with similar characteristics (it is a public university)) a specific study of these variables was not necessary.
To analyze the information obtained in the fieldwork, consisting of the dozens of documents prepared by the students (comments on the MOOC courses presented in personal edublogs), the most appropriate guidelines for documentary analysis were used in the context of qualitative methods [67][68][69][70][71][72]. To this end, a simplification of the information was carried out through the selection, grouping, categorization and coding of the collected data. During the coding, each textual unit was identified, analyzed and linked with its corresponding category through a mixed procedure (inductive-deductive). Subsequently, the frequency process began. Finally, the analysis process ended in which the different units of information collected were interpreted to guide the inference and interpretation phase of the results that will be presented.
Focusing on and detailing the analysis carried out, it should be emphasized that we obtained the 1962 frequencies offered by the students from the words or sets of meanings as registration units. This approach allows us to deal more deeply with a complex topic with high levels of interpretation that purely quantitative research alone cannot determine [73,74]. The development was organized in three phases: The first phase consists of an approach in which the contributions of the students were analyzed through the technique of data reduction and inter-rater coding. This phase constitutes the realization of rational procedures that consist of categorizing and coding the data, identifying and differentiating the units of meaning. A second phase consisted in the simplification and selection of the most important macrocategories according to the students. This process comprises several sub-phases: separation and identification of categories and classification, synthesis, grouping and coding of the units. Two evaluators participated in the coding process, coding the written and audiovisual interventions of the students throughout the academic years. Due to the high number of discursive units identified, the "Guetzkow U" index was calculated, which measures the coincidence in the number of units identified by two independent evaluators and coders according to the following formula [75]: where O1 represents the number of units identified by encoder 1 and O2 represents the number of units reported by encoder 2. Subsequently, the synthesis process and the meeting of key representative categories were developed. Finally, a third phase was generated in which a coding process was carried out, carried out by the Atlas-Ti program, of the main advantages, difficulties and weaknesses associated with the same challenges as the "Memo" proposals, and an explanatory network of the main proposals.
The results of this phase, after three rounds of coding the "U of Guetzkow" index, obtained a good adjustment value (0.0073) showing a 95% agreement between the units coded by the two evaluators. On the other hand, and although there is discussion in the literature about it, the Kappa index was calculated. According to the popular reference levels of strength of agreement measured, it reflected a result (κ = 81) classified as very good [76], p. 2. In general, the analysis methods used satisfied the characteristics we were looking for in the study, and allowed us to achieve the objectives pursued in a rigorous and reliable way.

Results
Once the analysis of the obtained data has been completed, we can carry out the presentation of the results and its interpretation. To facilitate its presentations, we have established two (2) frequency tables below, one with the principal characteristics that the students considered positive in relation to the MOOC (Table 1) and another collecting the characteristics that they estimated were negative or, in their case, improvable (Table 2).
There were 1052 frequencies collected focused on positive aspects in relation to MOOC courses. Its defining characteristics (such as free or open courses), were highlighted by future teaching professionals. Later we will carry out a specific analysis of each one of them. It should be noted that practically all of the collections were established by a high percentage of students. Only one was in the minority, the characteristic that it is possible to take several MOOC courses at the same time for the reason that they can be taken at any time. In the subsequent table of frequencies, focused on the negative characteristics, it can be seen that there are none so exceptional in this case.
In relation to the MOOC phenomenon, 910 frequencies were collected as negative or improvable. It is significant to note that most of the courses they took were in English. However, they did not find it a problem as we had initially anticipated. It should be taken into account that they took the courses in a different language than the one they are studying, which is Spanish. In general, it can be determined that in the total of frequencies the positive aspects are superior to the negative ones.
However, the differences are not important, which denotes that the MOOC courses, globally, are not as successful as in their early years. Taking into account the frequencies identified, it is possible to defend that the future teachers of the analyzed sample considered the following as positive characteristics of the MOOC courses: Quality university content; It is possible to take several courses at the same time; Certificates can be obtained; Allow participation in discussion/debate forums; Offer time flexibility; Multimedia materials are used; There is no limit to the number of tuitions; Free of charge; Training is online; It is possible to do many courses; It contributes to the training of the disadvantaged; Collaborative social networking is offered; Support for initial and continuing training.
On the other hand, those that they considered negative, or at least that could be improved or represent a significant barrier, were the following: Inadequate evaluation system; There is a high drop-out rate; Requires great autonomy on the part of the student; Lack of pedagogical monitoring; Display material is standard; Dispersion of information; Additional cost of the official certificate; Massive; It requires technical knowledge; Need for Internet access; Predominance of MOOC courses in English; Some MOOCs are not adapted; It is a new business model. It is possible to obtain much more information by working with percentages. For this purpose, Figure 2 shows the percentages concerning the contributions linked to the advantages offered by these training spaces:  The percentage analysis allowed us to discover that the characteristic regarding MOOC courses that university students who are preparing to become future teachers appreciate the most is free usage (18.6%). It is also very important, especially in the field of socio-educational contexts, that they establish as a relevant characteristic (the second most valued) that they contribute to the training of the most disadvantaged people, population layers or geographical spaces (14.54%). The third most significant characteristic (10.74%) is that MOOC courses are extremely flexible and can be temporarily adapted by the student to their needs.
Behind these characteristics, and highly valued in this type of training arising from the digital paradigm, there are others that are also highly appreciated, such as the fact that several courses can be taken at the same time (8.26%), which speaks to us today of the demands in the field of education and the need for extensive training. MOOCs offer quality university content (7.88%), in many cases from prestigious universities; that allow participation among students through forums and discussion groups (7.79%), which generates a great wealth of communication and learning; and that academic certificates and recognition of the activity can be obtained (7.69%). We initially thought this feature would be more prominent, especially due to the need to present evidence of all training activities both on an academic and professional level. It has caught our attention that there are other more valued aspects.
On a second plane, but also relevant, we find that these courses can lead to the creation of collaborative social networks (6.84%) in this new context of collaborative and interactive learning generated in the virtualization of higher education. It is an online training offer (6.74%), which allows access from any circumstance and place and there are no limits on the number of tuitions (5.32%). They are useful for both initial and continuing training (3.89%). All of these characteristics are closely related to new flexible, open and dynamic training spaces, clearly an alternative to traditional classroom processes.
Finally, and always as a positive feature of the MOOC courses, pre-service teachers also valued the fact that there is a very wide range of these courses (2.85%) and that the materials presented on many occasions have been multimedia (1.91%). In general, students have been very favorable towards MOOC courses and what they can imply, both in their training and in their presence as a training offer. They are also aware that this is a phenomenon of great interest in the field of higher education. The percentage analysis allowed us to discover that the characteristic regarding MOOC courses that university students who are preparing to become future teachers appreciate the most is free usage (18.6%). It is also very important, especially in the field of socio-educational contexts, that they establish as a relevant characteristic (the second most valued) that they contribute to the training of the most disadvantaged people, population layers or geographical spaces (14.54%). The third most significant characteristic (10.74%) is that MOOC courses are extremely flexible and can be temporarily adapted by the student to their needs.
Behind these characteristics, and highly valued in this type of training arising from the digital paradigm, there are others that are also highly appreciated, such as the fact that several courses can be taken at the same time (8.26%), which speaks to us today of the demands in the field of education and the need for extensive training. MOOCs offer quality university content (7.88%), in many cases from prestigious universities; that allow participation among students through forums and discussion groups (7.79%), which generates a great wealth of communication and learning; and that academic certificates and recognition of the activity can be obtained (7.69%). We initially thought this feature would be more prominent, especially due to the need to present evidence of all training activities both on an academic and professional level. It has caught our attention that there are other more valued aspects.
On a second plane, but also relevant, we find that these courses can lead to the creation of collaborative social networks (6.84%) in this new context of collaborative and interactive learning generated in the virtualization of higher education. It is an online training offer (6.74%), which allows access from any circumstance and place and there are no limits on the number of tuitions (5.32%). They are useful for both initial and continuing training (3.89%). All of these characteristics are closely related to new flexible, open and dynamic training spaces, clearly an alternative to traditional classroom processes.
Finally, and always as a positive feature of the MOOC courses, pre-service teachers also valued the fact that there is a very wide range of these courses (2.85%) and that the materials presented on many occasions have been multimedia (1.91%). In general, students have been very favorable towards MOOC courses and what they can imply, both in their training and in their presence as a training offer. They are also aware that this is a phenomenon of great interest in the field of higher education.
There are, however, other features of these courses that pre-service teachers consider to be negative or need to be improved. We present in Figure 3 the main ones that we have been able to obtain the percentage of: Educ. Sci. 2020, 10, x FOR PEER REVIEW 9 of 16 There are, however, other features of these courses that pre-service teachers consider to be negative or need to be improved. We present in Figure 3 the main ones that we have been able to obtain the percentage of:  Among all of them, the one that stands out especially is the lack of pedagogical supervision of the teaching-learning process by teachers who teach MOOC courses (15.05%). This is a very important piece of information, especially considering that those who are evaluating them are university students preparing to be teachers. It denotes that MOOCs are an interesting training offer but that it is alien to the specific fields of educational sciences. Also in this context, it is striking that the second characteristic they consider to be negative is that the material presented is very standard (13.18%). It is a fact that agrees with the low percentage of future teachers who praised the use of innovative materials such as multimedia, as we saw previously. It is determined, therefore, that for the most part MOOC courses do not offer significant didactic or resource innovations. Which agrees, in the same way, with the third and fourth characteristics that they consider to be deficient, such as the inadequate evaluation processes (11.64%) and the dispersion of information (11.31%). Once again it is a didactic and pedagogical question, such as the evaluation of learning and the organization of content. In these aspects, the MOOC phenomenon has different gaps.
It is interesting to have verified, therefore, how the main problems or barriers generated by this phenomenon, in the opinion of the future teachers of the sample, are pedagogical in nature. In the background, although also very prominent, they find other problems such as the high drop-out rate (10%); that require great autonomy on the part of the student (8.57%), which affects precisely that lack of pedagogical advice mentioned above; the additional cost involved if someone wants an official certificate (8.24%), which in essence would make them not completely free, one of the defining elements.
In the last part we find that another of its main and constituent characteristics is also seen as a disadvantage, that is, that they are massive (5.27%), undoubtedly produced by courses in which there are hundreds of students enrolled and this thus makes it difficult for a quality didactic process. Some MOOCs are not properly adapted (4.83%) and technical knowledge for proper monitoring is required (3.73%). MOOCs are considered a business model (3.62%) and require an Internet connection (3.40%). We would like to emphasize that the fact that pre-service teachers considered it a disadvantage to think that this is a new business model was a matter of great interest since it allowed Among all of them, the one that stands out especially is the lack of pedagogical supervision of the teaching-learning process by teachers who teach MOOC courses (15.05%). This is a very important piece of information, especially considering that those who are evaluating them are university students preparing to be teachers. It denotes that MOOCs are an interesting training offer but that it is alien to the specific fields of educational sciences. Also in this context, it is striking that the second characteristic they consider to be negative is that the material presented is very standard (13.18%). It is a fact that agrees with the low percentage of future teachers who praised the use of innovative materials such as multimedia, as we saw previously. It is determined, therefore, that for the most part MOOC courses do not offer significant didactic or resource innovations. Which agrees, in the same way, with the third and fourth characteristics that they consider to be deficient, such as the inadequate evaluation processes (11.64%) and the dispersion of information (11.31%). Once again it is a didactic and pedagogical question, such as the evaluation of learning and the organization of content. In these aspects, the MOOC phenomenon has different gaps.
It is interesting to have verified, therefore, how the main problems or barriers generated by this phenomenon, in the opinion of the future teachers of the sample, are pedagogical in nature. In the background, although also very prominent, they find other problems such as the high drop-out rate (10%); that require great autonomy on the part of the student (8.57%), which affects precisely that lack of pedagogical advice mentioned above; the additional cost involved if someone wants an official certificate (8.24%), which in essence would make them not completely free, one of the defining elements.
In the last part we find that another of its main and constituent characteristics is also seen as a disadvantage, that is, that they are massive (5.27%), undoubtedly produced by courses in which there are hundreds of students enrolled and this thus makes it difficult for a quality didactic process. Some MOOCs are not properly adapted (4.83%) and technical knowledge for proper monitoring is required (3.73%). MOOCs are considered a business model (3.62%) and require an Internet connection (3.40%). We would like to emphasize that the fact that pre-service teachers considered it a disadvantage to think that this is a new business model was a matter of great interest since it allowed for different readings. In this case, they considered that the essential gratuity to the MOOCs was incompatible with the generation of a business model (for example derived from charging for the certificates), placing it in a context of idealization of the altruistic offer of these courses, thus considering it a negative element. However, it is clear that these concepts do not have to be in conflict with each other. In general, most of the problems or barriers listed in this block are structural or technical, and are far removed from the pedagogical disadvantages. Lastly, a striking fact is that they do not consider it a problem that most MOOC courses are in English (1.09%).
Having presented the results obtained, it is possible to determine that, globally, the students in the sample analyzed find more strengths than weaknesses in the MOOC courses. It is, therefore, a phenomenon that they find it extremely interesting as a complementary educational option to their university studies. Although they have not been as successful as was predicted a few years ago, they are nevertheless an interesting and appreciated training proposal.

Discussion
The MOOC phenomenon already has, without a doubt, an indisputable presence in the higher education space. In addition, it is beginning to to be valued by students, especially those in the field of education-perhaps they will be future teachers-in a positive way. This new modality of expansion of knowledge through open, massive and online courses, which are part of the new educational fabrics of most prestigious international universities, can become a dynamic element of the curriculum in the biotic ecosystems of educational institutions, limited in time, spatially limited and often reserved for social elites [11,[77][78][79][80]. Massive and open training represents a challenge for university institutions and the teaching community that must redefine the current methodological paradigm to enter new, more open, interactive, collaborative and ubiquitous curricular forms, in symbiosis with a more dynamic, holistic and human evaluation inserted in more flexible and diversified curricula adapted to the labor ecosystem [81][82][83]. With this, it will be possible for students to promote and facilitate the implementation of their own competence itinerary for their academic and professional development [84]. One of the most interesting elements is to understand how students manage time in these courses, on which more studies are needed [85]. Of course, it does not mean that everything is positive in MOOC courses, on the contrary, there are many elements and characteristics that can be clearly improved [86][87][88][89][90][91]. However, it is undeniable that, globally, they have represented an important advance in the field of distance education.
Our research has determined that one of the main advantages that this new philosophy and emerging trend of online training can offer, which due to its inherent nature of being free can help to reduce the digital divide of marginal social groups, is that anyone, regardless of their origin, can be trained. This is in line with what has been demonstrated by various authors [92][93][94][95][96][97]. Furthermore, MOOC courses can provide a sustainable and promising educational paradigm for distance learning [98][99][100]. On the opposite side, regarding weaknesses, it is worth noting their high dropout rate and poor tutoring and assessment systems in line with other research [30,101]. Similarly, these open mass networked courses can be the new sites of cognitive reflection and recreation, the new habitats for communication and innovation in university digital ecosystems and the seed of new mass learning scenarios [102]. Thanks to the philosophy of this training modality, it can lead to a democratization of higher education [103][104][105].
Our study supposes an approach to the problem from the perspective of future teaching professionals. It may be appropriate in the future to establish larger samples and in longer periods of time, as well as to extend the study to other countries, since in this case it has only been carried out in Spain. For example, a comparative study between Latin American countries could be carried out to establish whether the perception of MOOC courses is similar in this wide geographic space of common cultural characteristics or depends on the specific circumstances (economic, social, etc.) of each country. Methodologies that have been very positive from this comparative approach could also be used [106][107][108][109][110]. This methodology could also be applied to other countries in the international arena, we cannot forget that the MOOC phenomenon is global, precisely one of its defining characteristics.

Conclusions
Massive and open training represents a challenge for university institutions and their teachers who must redefine the current methodological paradigm to enter into new ways of designing more interactive, collaborative and ubiquitous educational materials, together with new, more dynamic and self-managed forms of evaluation [111,112]. For the University to be integrated into these new training spaces, it must adapt the conformation of its study plans from a broader and more diversified catalog of subjects that allow the student to create their own map of competencies within those of an academic or professional field. In this way, the concept of diversified learning takes on all the sense in contrast to the current uniformity of university programs. The trend should be to offer open programs in direct relation to the work, academic and professional world that position students before the possibility of creating a training itinerary that adapts to the necessary skills in a changing and diversified world open to new tools and widely interconnected spaces [113][114][115].
The research carried out has shown that, in the opinion of the Spanish students who have participated in the sample, future teachers, MOOC courses are valuable as teaching models in socio-educational contexts. They offer undoubted advantages such as their free service, training for disadvantaged groups, flexible hours, etc. However, its drawbacks with respect to other educational and training formats are also important. For example, it is considered that in these courses the student is not adequately monitored, that the population that is carried out in the apprenticeships is inadequate or, likewise, the great dispersion that sometimes occurs with the information presented. Mainly, in essence, these are problems of a pedagogical nature. This is a very interesting aspect because one of the great challenges of the MOOC phenomenon, beyond its defining characteristics, is the development of pedagogical structures that allow the maximum potential of telematic environments to be obtained. Precisely the fact that there is a wide typology of MOOC courses (cMOOC, xMOOC, tMOOC, etc.) implies the creation of models that try to adapt this instructive reality, in the best possible way, to the educational and training needs of the users. Nor should it be forgotten that one of the greatest controversies regarding this modality of distance education has been generated by studies on the authentic possibilities of so-called connectivism, which, once again, is closely linked to essentially didactic and pedagogical questions. That is to say, and as has been reflected in this research, and shown to us by pre-service teachers, the principal improvements should be made not in that which is directly related to the technological or technical, for which there is practically no discussion, but rather with that which is essentially educational.
More studies are necessary to establish whether there are common patterns in terms of positive and negative elements in all MOOC courses as this would be decisive for their improvement. We are talking about new models born from the emergence of the digital paradigm that allow new educational scenarios of great interest and scope, which must be perfected to achieve maximum efficiency [116,117], it is special, as we have shown, in a pedagogical field above the technician. For this reason, research is so necessary that allows us to obtain direct information on their development and evolution in order to optimize, from a pedagogical and training point of view, the quality of these offers. What is fundamental for the processes of digitization and virtualization of higher education, towards which we are inevitably heading.