International Occupational Health and Safety Management-Systems Standards as a Frame for the Sustainability : Mapping the Territory

A significant part of literature has shown that the adoption of Sustainability and Health-Safety management systems from organizations bears some substantial benefits since such systems (i) create a suitable frame for the sustainable development, implementation and review of the plans and/or processes, necessary to manage occupational health-safety (OHS) in their workplaces and (ii) imply innovative thinking and practices in fields of economics, policy-making, legislation, health and education. To this context, the paper targets at analysing current sustainability and OHSMSs in order to make these issues more comprehend, clear and functional for scholars and practitioners. Therefore, a literature survey has been conducted to map the territory by focusing on two interrelated tasks. The first one includes the presentation of the main International Management Systems (IMS) with focus on Sustainability and OHS (S_OHSMS) topics and the second task depicts a statistical analysis of the literature-review findings (for the years 2006–2017). In particular, the main purposes of the literature research were: (i) the description of key points of OHSMS and sustainability standards, (ii) the comparative analysis of their characteristics, taking into account several settled evaluation-criteria and (iii) the statistical analysis of the survey’s findings, while our study’s primary aim is the reinforcement of OHMSs’ application in any organization. The results evince, that the field of industry (with 28%) and also of the constructions (with 16%), concentrate the highest percentage of OHSMS use. In general, there were only few publications including OHSMSs (referred to various occupational fields) available in the scientific literature (during 2006–2017) but on the other hand, there was a gradually increasing scientific interest for these standards (especially during 2009–2012).


Introduction
Occupational accidents have a key impact upon human probity, create high expenses for the social health/insurance system of any country and deteriorate the sustainability of societies.Moreover, occupational "health and safety" is one of the most vital issues in any organization (or part thereof) because it assures its continual operation, productivity and efficiency.It is known that any occupational accident or illness can affect both the employee, business operation and overall sustainability performance of firms.These disturbances, which can be valued mainly through the lost working-hours and the production-delays, can affect the quality of the enterprise's product [1] and the reputation of firms.
To overcome such problems, many organizations have adopted health/safety and sustainability management systems (with sufficient documentation/certification).Any organization is gradually more concerned with improving sustainability and occupational health and safety (OHS) performance and this is achieved by controlling sustainability and OHS risks, in accordance with their sustainability and OHS policy and in the context of strict legislation.There are plenty of organizations that apply sustainability and OHS reviews (or audits) to assess their sustainability and OHS performance.Nevertheless, these reviews and/or audits may not be sufficient to afford an organization with the assurance that its performance will maintain to fulfill the specific legal and policy requirements of this organization.To be efficient, they must be carried out within a structured management system that is embedded in the organization [2].
Moreover, Occupational Health and Safety Management Systems were created after a lot of well-documented and severe industrial-accidents, during the decades of 1970 and 1980 (e.g., the Flixborough Accident in 1974, the Seveso incident in 1976 and the Piper Alpha disaster in 1987).Studies and research applied on these incidents, unveiled deficiencies in main approaches concerning S_OHMS and regulation and revealed the need to approve approaches which thoroughly addressed both education and engineering responses.The propagation of OHS management systems that have been observed globally since the decade of 1990 [3], has noticeably increased the focus on techniques (and/or tools) concerning performance measurement [4].
A Health and Safety Management System provides a framework for managing health and safety risk.Generally speaking, we can consider the term "risk" as the likelihood that someone (or something) will be harmfully affected by the hazard, while "hazard" is any insecure condition (or source of undesirable/adverse events) with strong potential for creating harm or damage.Alternatively, "risk" would be defined as a measure (under ambiguity) of the hazard severity or a measure of the likelihood and consequence of injurious/adverse effects [5][6][7][8].
Public interest in the field of risk analysis and assessment (RAA) has been expanded during the last four decades, so that risk analysis constitutes an efficient and widespread procedure that completes the whole management of nearly all aspects of our life.Thus, almost all managers (e.g., of health care, environment, physical infrastructure systems, etc.) incorporate RAA techniques in their decision-making process.In addition, the universal adjustments of risk analysis by many disciplines (like industry, government agencies) in decision-making, have led to a unique development of theory and methodology and also of practical tools [8].
According to P. Marhavilas [9], risk analysis is a vital process for the safety strategy of any firm, having as main objective the elimination of any potential of damage or harm in its production, while the quantified risk evaluation apparently is the most critical part of the entire procedure of assessing occupational hazards and/or unsafe situations in the workplaces.Furthermore, a complex human-machine system that is composed of humans, machines and their interaction, could suitably be expressed by a system model.Therefore, RAA constitutes a substantial tool for the safety strategy of an organization and also for the assessment process of the occurrence, the consequences and the impact of human activities on systems with hazardous features.
The introduction of a management system in any organization provides a frame for the sustainable development, implementation, sustainability and review of the plans and/or processes which are essential for the occupational health-safety (OHS) management in the workplaces.Since the appearance of such systems during the decade of 1970, significant growth of the approach has occurred, driven by the following factors: (i) OHS is affected by all aspects of the design and functioning of an organization, (ii) the design and management of health and safety systems must associate people, environment and also technical systems in extent that reveal an organization's unique features, (iii) health and safety is a management function and requires broad management involvement, (iv) accidents, injuries and diseases are an indication of a problem in the system and are not coming from a human error and (vi) performance goals must illustrate management objectives [10].
The international management systems (IMS) standards, covering the field of occupational health and safety (OHS) in worksites, are intended to provide organizations and enterprises with elements of an effective occupational health and safety management system (OHSMS) that can be associated (or integrated) with other management requirements and help organizations achieve OHS and economic objectives.
The S_OHSMS standards specify requirements for an OHS management system, in order to allow an organization to develop and implement a strategy which take into account legal requirements about OHS risks.These are intended to apply to all types of corporations and to establish various geographical, cultural and social conditions.Such a system enables a corporation to create an OHS strategy, develop objectives, scopes and processes to achieve the policy obligations, take action as needed to improve its performance and demonstrate the compliance of the system to the requirements of this OHSMS standard.Moreover, the general aim of OHSMS standards is to support capable OHS practices, in the framework of socio-economic needs [2].
The British Safety Council (BSC) and the International Labour Organisation (ILO) made a research in which valued the rewards of the prevention of accidents and/or diseases in enterprises within a period of 2 years.This study shows that the corporation which had adopted such a safety management system had the following results [11]: (i) productivity improvement, (ii) significant reduction of the frequency of cases of absence, (iii) significant reduction of compensation claims and insurance costs, (iv) improvement of the psychology of labor in addition with the increase of morale and concentration at work and (v) improving the company image to customers and suppliers.
In this work, the foremost IMS standards of promoting sustainability and OHS are presented, on the one hand and on the other side, the statistical results of a research (literature survey), reviewing vicarious scientific journals (for years 2006-2017).Thus, the main aim of our study is the strengthening of OHSM standards' application, in any organization (i.e., of any type and size).
The rest of the paper consists of five sections including (i) an overview of the OHSMS standards, (ii) a methodology (iii) the results of a statistical analysis, (v) the discussion and (vi) the conclusions.

Theoretical Background
A significant part of literature focuses on RAA of sustainability and health/safety accidents.The growing complexity of services, processes and products, entering the market, requires that the safety aspects must be considered with high priority.Undoubtedly, there is no absolute safety, so that some risk always remains in a specific worksite, constituting the "residual risk."Thus, any service, process and/or product can only be relatively safe.To continue, relative safety is achieved by risk degradation to a tolerable level, which is called as "tolerable risk," which is defined by the exploration of the finest balance between the ideal safety and the demands to be met by a service/process/product and factors such as profit for the user and cost effectiveness.Tolerable risk is succeeded by the procedure of risk assessment (risk analysis and risk evaluation) and risk reduction [12], while "risk management" can be considered as the entire methodology that includes both "qualitative" and "quantitative analysis techniques" [13][14][15].
In the scientific literature, four phases are prominent, as far as quantitative risk assessment is concerned (see for example the works [9,[16][17][18]) depicted as follows: (a) Qualitative analysis, that incorporates the system definition and its scope, the hazards identification/description and the failure scenarios as well.(ii) Quantitative analysis, which incorporates the probabilities determination and the consequences of the defined undesirable events and also the risk quantification by a number (i.e., the risk quantity) or by a graph as a function of probabilities and consequences.(iii) Risk evaluation, which incorporates the evaluation process, on the base of the results of the former analysis.(iv) Risk control and reduction phase, which includes the step of taking measures (in order to be reduced the risk) and taking into account how the risks can be controlled (for example by inspection, maintenance or warning systems).
According to the IEC [15] the concept of risk presents two components that is, the frequency (or probability) that a harmful event (or an unsafe situation) is expected to occur and the consequences of this event.Moreover, CCPS [19] determines the risk as a measure of economic loss or human hurt in the frame of the likelihood and the magnitude of the loss (or damage).
To eliminate risks from sustainability and Health and Safety problems, a number of management systems has been proposed.In general, a management system is the methodology or the way by which an organization manages its internal procedures (or subjects) in order to achieve its objectives, which are associated with a number of different topics (including service quality or product quality, operational capability, environmental accomplishment, health and safety in the workplaces, et cetera).The level of the system's intricacy will depend on each organization's specific context.In small organisations, there is no (or less) need for extensive documentation because it is transparent how the employees contribute to the organization's overall aims.On the other side, more complicated corporations operating, may need extensive documentation in order to accomplish their organizational goals.Moreover, international management system (IMS) standards help organizations improve their performance by specifying repeatable steps that organizations consciously implement to accomplish their aims and to develop an organizational culture [20].
According to Gallagher [21], OHSM systems have been defined as "a combination of the planning and review, the management organizational arrangements, the consultative arrangements and the specific program elements that work together in an integrated way to improve health and safety performance." Table 1 presents an overview of the most important worldwide OHSMS standards, based on selected information that has been collected from various sources and from the review of scientific literature as well."It is based on (i) "Plan": establish the aims and processes which are essential for the achievement in accordance with the organization's OHS policy, (ii) "Do": implement the processes, (iii) "Check": monitor and measure processes against OHS policy, objectives, legal and other requirements and report the results, (iii) "Act": take actions to continually improve OHS performance" Social dimension [36,37] Over the past three decades, the use of OHSMS has become common in worksites in the developed economies, noting the fundamental elements of a OHSMS [38].It is worth noting that many international management system standards have contiguous structure, containing a large number of the same terms and definitions.These characteristics are helpful for those organizations that operate an "integrated" management system [20] which can merge the requirements of two or more management system standards simultaneously (for example OHS with Environmental, or OHS with Quality management systems).

Methodology
Today, OHS issues are considered very important for organizations for economic (e.g., decrease lost working days), environmental (e.g., environmental hazards for employees) and social issues (e.g., ethical working conditions).It is well known that the major body of relevant literature focuses on the regulatory requirements of organizations regarding OHS issues, while a smaller part of the literature emphasizes on voluntary initiatives of organization on OHS issues.However, the voluntary trend of organizations has lately gained ground under the context of social responsibility of organizations to contribute to sustainable development [39].This is integrated into the context of organizations as a commitment to OHS issues beyond the law which should be achieved through voluntary implementation of OHS standards (e.g., OSHAS 18001, ISO 45001).To this end, the suggested research methodology recommends sustainability concept as a frame to examine a set of current OHS standards (Table 1) through: (a) environmental dimension of sustainability (ISO 14001) and (b) social dimension of sustainability (BS 8800; HSG 65; OHSAS 18001; ILO-OSH 2001; ASINZS 4801; SS506; Une 81900: 1996 EX; Uni10616 and ISO 45001).It is necessary to clarify that the sustainability concept is only utilized as a frame of analysis and classification of OHS standards and none effort has been made to explain how the OHS examined standards contribute to aspects of sustainable development.
Additionally, the suggested research methodology is based on three sequential steps.The first step pertains the selection of journals, the second includes the appropriate keywords for addressing research questions and the third shows the coding method.In particular, the review of the scientific literature was accomplished by the research of ten representative scientific journals which focus on sustainability and health and safety issues (Table 3).The selection of these papers was based on the following two criteria: (a) the focusing on health and safety issues and sustainability and (b) the existence of high impact among scholars (Q1 and high impact factor).More specifically, taking into account that few other systematic (e.g., [3]) or narrative (e.g., [40][41][42][43]) literature reviews exist, on the topic of OHSMS standards, the time period before the year 2006, we investigated and studied published articles of the previous referred journals, collecting a large number of around N = 9822 papers, throughout the years 2006-2017.In particular, the methodological steps of the survey included: (i) investigation of the literature (e.g., through SCOPUS); (ii) screening the journals with the highest number of articles and the most important studies on S_OHSMS standards; (iii) selection of relevant studies; (iv) appraisal of the quality of the research evidence in the studies.The appropriate keywords we used in the survey were "Occupational Health and Safety", "Sustainability", "Management Standards".

Results
The procedure of reviewing the scientific literature, unveiled only a few published papers on OHSMS standards referred to many different fields (like construction, industry, engineering, transportation, chemistry, oil and refinery, food sector, et cetera).These papers address concepts, tools and methodologies that have been created and practiced in such areas as design, development, quality-control and maintenance, in association with occupational risk assessment.
The different OHSMS standards follow, in general, similar paths between "start" and "finish."Taking into account the results of our literature review, we present in the following Table 4, the comparison between the above referred OHSMS standards.This table depicts an overview of their features, comparatively with several settled evaluation-criteria.The investigation of the scientific literature revealed S = 75 published technical articles which were associated with OHSMS Standards in the worksites and concerned many different fields (like construction, chemistry, engineering, transportation, medicine, etc.).
In Appendix A (Table A1) we show the classification results of the 75 articles incorporating OHSMS standards which were defined by the investigation of N = 9822 papers of ten sources covering the time period 2006-2017.Table A1 uses eight columns for example, the number (or numerical code) of the paper (A), the paper's citation information (columns B, C, D), the OHSMS standard's name (E), the kind of the paper's data or material (F), the field of application (G) and the source (journal's name) [column H].
In Appendix B (Table A2) we illustrate the statistical results of the survey including the following: (i) the absolute frequency N i that is, the number of investigated papers per journal (col.The survey relating to the above 10 journals revealed (according to Appendix B, Table A2) that the papers concerning OHS and including OHSMS standards were very few (i.e., for JAE the maximum percentage is only 0.34% taking into account the total number N of the investigated papers and only ~4% as far as the normalized per journal percentage is concerned), while the majority (i.e., 99.24%) is represented by papers without OHSMS standards.Taking into account the graphs of Figure 1, we note that although AAP is the journal with the most publications for 2006-2017 (Figure 1a), JSS is the journal with the greatest number of publications, concerning OHSMS standards (Figure 1b-d).
Besides, the pie-chart of Figure 1e reveals that the OHSAS 18001 standard, presents the higher relative occurrence-frequency (47.06%) in comparison with the other OHSMS standards (of Table A2 in Appendix B), that is, OHSAS 18001 is the most frequent OHSMS standard according to scientific literature review.This can be related with the fact that this international standard was the result of the co-operation of 13 different international organizations which represent 80% of the certification bodies.
In addition, the graph 1f which depicts the percentage distribution of the articles (with OHSMS standards) shows that "Empirical/Qualititative" is the most frequent type compared with various types of data.
In Figure 2 we illustrate the yearly variation of the number (nST) of papers with OHSMS standards, published by the previous referred 10 journals, during 2006-2017 (panel a) and the corresponding percentage distribution of papers in association with the year of publication (panel b).The inserted bar-graph in panel a, depicts the relative occurrence frequency of papers concerning OHS which include OHSMS standards in association with the title of the 10 journals (horizontal axis).
The curve of the graph of Figure 2a shows the existence of a long-term trend factor with positive inclination (throughout the period 2007-2012), with negative inclination (for the period 2013-2015) and also with a positive inclination (throughout the 2016-2017).In particular, there is a gradual increasing for the period 2006-2012 (with a maximum in years 2011 and 2012), while for the years 2013-2015, an abrupt decreasing with an intensive negative slope.The second graph (pie-chart) shows that 2011 and 2012 are the years with the greatest percentage of papers referring to OHSMS systems.
Apparently, one reason is that the industrial organizations present more dangerous working conditions in comparison with other corporations (for example due to the existence of heavy machines in the production procedure) [9,44].Moreover, it is apparent that the construction sector is following, due to the greatest number of occurring incidents.

Discussion
Taking into account that nearly 2.3 million of people die per year due to work-related accidents and/or diseases, occupational injuries and/or illnesses are significantly adverse for the employers and also for the state's economy, resulting in losses from early retirements, the staff absences and the high insurance costs [45,46].Thus, occupational health/safety aspects represent some of the most crucial subjects of the social policy in the EU and as a consequence the Lisbon strategy was adopted for growth and employment, which aims to create jobs with care in health and safety for the employees.
Over the past three decades the use of Occupational Health and Safety Management Systems (OHSMS) has expanded in the workplaces of developed economies and their growing usage could be attributed to many reasons and factors.In particular, OHSMSs embody the principles of "continuous improvement" or "quality management" which have been used and applied by enterprises for improved business competitiveness.Taking into account that the principles of OHSMS are similar to methods such as Total Quality Management, it is presumable that experience with TQM has formed a basis for new applications of removing occupational hazards and improving safety awareness [47].
OHSMS differ as far as the miscellaneous techniques of implementation are concerned.According to Frick and Wren [40] there are three types of implementation, that is, voluntary, mandatory and hybrid.The first one exists when companies affiliate OHSMS on their own volition.On the other hand, mandatory systems have been enforced in many European countries (for example in Denmark and Norway) where the state's legislation requires establishment of a RAA system.Quasimandatory methodologies may also exist in case of external commercial requirements which take the form of legislative demands.Thus, many organizations settle OHSMS to comply with the demands of customers and suppliers, principal contractors and other commercial bodies.Hybrid methods require an admixture of voluntary motives and legislative requirements [47].It is worth noting that, only a fraction of all employers and/or organisations have introduced what it is called as OHS management systems (such as OHSAS 18001) [2].Yet, within the EU, California (USA) and in many other countries, employers are required by regulation mandated to organise a systematic OHS management (in the EU according to the Framework Directive of 89/391/EEC).
Compliance with these regulations will result in an effective prevention of OHS risks, even without introducing OHSAS or any other voluntary OHS management system.Some other distinctions that should be underlined are the following: (i) The term "systematic" in mandatory systematic OHSM is not at all the same as the term "system" in voluntary OHSM systems.This means that the UK's HSG 65 is quite different from the other described "systems."HSG 65 constitutes guidelines (best practice) for how to comply with the mandatory regulation of systematic OHSM (transposing of EU directive 89/391/EEC into UK legislation) while all the other listed "systems" are voluntary and more or less commercial products (which still can be very useful).(ii) Regulated mandatory systematic OHSM is not at all identical to voluntary OHSM standards.
This article aims to cover both of them.In any case both mandatory OHSM (such as in all of the EU, since 1989, through 89/391/EEC but also in many other states, for example, in California since 1991) and the much more complex commercial products of voluntary OHSM systems (such as OHSAS 18001) are critically discussed and distinguished.(iii) The term "Standard" is also a term with importantly different meanings.In Anglo-saxon countries this is often the same as a regulation but a voluntary standard (such as ISO) is (by definition) not a regulation.
The implementation and application of a range of efficient OHS management actions systematically, can contribute to optimal results for all interested parties.Organizations of all types establish a systematic process to manage OHS and develop OHSMS systems within the context of (i) the general growth of concern from all interested parties about OHS, (ii) changes to legislation and (iii) other measures to foster sustained OHS improvement.There are many reasons for organizations to develop OHSMSs (for example legal imperatives, ethical concerns, industrial considerations, financial performance improvement, etc.).Implementation of an efficient OHSMS will create a reduction of workplace illnesses and injuries, minimizing the expenses associated with accidents [28].Consequently, the application of OHSMS standards provides a unique instrument for the development of a sustainable safety culture within enterprises.Besides, human factors (including the culture, politics, etc.) within organizations can make or break the effectiveness of any management system and needs to be considered very carefully when implementing a management system [22].An OHSMS standard specifies requirements in order to help any enterprise to formulate a strategy taking into account legislation and information about risks and/or harm.It applies to those hazards over which the organization may exert control and over which it can be expected to have an influence [28].
Other standards (like ISO 31000, IEC31010) constitute an introduction to selected techniques and compare their possible applications, benefits and limitations.They also provide references to sources of more detailed information.
With the globalization of the economy and the success of Quality Management Systems (QMS) and of Environmental Management Systems (EMS), organizations require a simple, integrated and also a global management system.For this reason, and due to the lack of a model for an OHS management system that has been accepted worldwide, systems or models, guides or norms of the OHS management, have been propagated throughout the world.
Previous investigations have recognized a research gap, as far as the studies of the reliability and validity of OHSMS standards, are concerned [48].In this study, the most considerable OHSMS standards created at the international level, are presented analysed at their updated version.In other words, our article introduces different standardized occupational and safety management systems (guidelines), which are commonly used internationally.In particular, the purpose of this work is to collect important information regarding the use of OHSMS standards by achieving a scientific literature investigation of vicarious journals (published by Elsevier B.V., Taylor & Francis and the American Society of Safety Engineers) covering the time period of 2006-2017.This is an interesting topic which combines academic papers and practically used standards.Subsequently, the main aims of this exploratory study are: (i) the depiction of commercial and industrial trends, as far as the OHSMS standards are concerned, (ii) the implementation of these standards and (iii) the reinforcement of their application in the worksites of organizations.
It is worth mentioning that, few other systematic literature reviews (like the one of Robson et al. [3]) or narrative reviews (e.g., [40][41][42][43]) exist, concentrating on the topic of OHSMS standards and concerning the years before 2006.So this is the reason for conducting our review throughout the years 2006-2017.In addition, the literature overview of Li and Guldenmund [49] has a different aim and describes safety management systems (SMSs) as far as the SMSs models are concerned, that is, accident-related models and organizational models.
The methodological steps of the survey included: (i) research of the literature; (ii) screening the journals with the most important studies on S_OHSMS standards; (iii) selection of relevant studies; (iv) appraisal of the quality of the research evidence in the studies.
The review unveils the following: • There are only a few publications including OHSMS standards (during 2006-2017), which are referred to a variety of occupational fields (like construction, industry, engineering, transportation, chemistry, oil and refinery, et cetera).

•
These papers address techniques that have been emerged in areas such as design/development, quality-control and maintenance, as far as occupational risk assessment is concerned.

•
"Safety Science" (SS) and "Journal of Loss Prevention in the Process Industries" (JLPPI) are the scientific journals which published (during 2006-2017) the most scientific papers concerning OHSMS.

•
The sector of "Industry" (with 28%) and also the "Construction" (with 16%), accounted for the highest percentage, as far as the usage of OHSMS standards is concerned, presumably because their work conditions are more unstable and dangerous in comparison with other occupational sectors (e.g., telecomunications).In addition, these sectors are very hazardous worldwide, owing to their unique dynamic nature, poor conditions and tough environment [44,50].

•
The comparison between the previous presented OHSMS standards (in Table 4), depicts an overview of their features, comparatively with various developed evaluation-criteria.

•
The OHSAS 18001 standard, presents the higher relative occurrence-frequency (48%) in comparison with the other OHSMS standards, due to the fact that this international standard was produced by the co-operation of 13 different international organizations which represent 80% of the certification bodies.

•
The percentage distribution of the papers (with OHSMS standards) reveals that "Empirical/Qualititative" is the most frequent type compared with other types of data.

•
Our selected graphs, show (for the distribution of the publications with OHSMS standards) the existence of a long-term trend factor with positive inclination (during 2007-2012), with negative inclination (during 2013-2015) and also with a positive inclination (throughout the 2016-2017).

•
In general, there is an increasing scientific interest for OHSMS standards, especially in period 2009-2012.

•
The entire objective of the usage of OHSMS standards is to support and promote efficient OHS practices, in balance with socio-economic requirements [2].

•
The OHSMS standards are not legally binding and have not got the intention to replace national laws or regulations and/or accepted standards.

•
OHSMS have been proposed as a way to reduce injuries and illnesses for businesses of all types and sizes [51,52].

•
The various OHSMS standards have common basic requirements and features but they are implemented in different processes.Besides, the different OHSMS standards follow, in general, similar paths between "start" and "finish."

•
Many organizations apply an "integrated" management system which combines the requirements of two or more management system standards simultaneously (for example OHSMS with Environmental, or OHSMS with Quality management systems standards).

Conclusions
Governments, employers and workers recognize, day after day, the posistive impact of introducing S_OSHMS standards at the organization level, both on the reduction of hazards/risks and also on productivity.In particular the benefits of effective S_OSHMS standards to any commercial body or enterprise include: (i) more effective usage of resources, (ii) improved financial performance, (iii) improved risk management and (iv) increased capability to deliver consistent and improved services and products.OHSMS standards are not intended to replace national laws, regulations or accepted standards but on the other side, their main aim is to support and promote efficient OHS practices, in balance with socio-economic requirements.
Using the previous analysis and its main outcomes, the next dominant conclusions can be extracted:

•
The application of OHSMS standards is not significantly extended in organizations and the knowledge about them has not been fully shared and expanded among the miscellaneous scientific fields, so we have the opinion, that the scientific community, have to transfer the similarities from one field to another.

•
The implementation of a "integrated" management systems which combine the requirements of two or more management system standards simultaneously (for example OHSMS with Environmental, or OHSMS with Quality management systems standards) would enable organizations to achieve efficient results on the reduction of risks and also on productivity.

•
OHSMS standards can be developed and implemented by organizations of any type and any size (large or small).

•
As this study is not an empirical research but a review, the value of the article rests on clear distinctions, definitions and analysis.Moreover this exploratory study, provides a rich description for the usage of OHSMS standards in workplaces and lays the background for further research into the reliability and reinforcement of their application in any organization.
As a general conclusion, our literature survey shows that: (i) only a small number of published articles focusing on OHSMS standards (and concerning miscellaneous occupational fields) are available for the period of years 2006-2017 and (ii) the scientific community expanded its interest for the usage of OHSMS standards, during the years of 2009-2012.

Moreover, Figure 1
illustrates for the time period of 2006-2017 the following: (a) the relative frequency F i = N i /N of the ten journals, concerning the total amount of their published articles, (b) the relative occurrence frequency of papers (referred to N) with OHSMS-standards f ST(i) = n ST(i) /N, (c) the normalized (per journal) occurrence frequency of papers concerning OHS which include OHSMS standards f i * = n ST(i) /N i (d) the relative occurrence frequency of papers (referred to S) which include OHSMS standards f** ST(i) = n ST(i) /S, (e) the relative occurrence-frequency of the various OHSMS standards (which are included in the above referred S = 75 papers) and (f) the percentage distribution of the papers with OHSMS standards in association with different types of data.

Figure 1 .
Figure 1.It depicts for the period of 2006-2017 the various relative occurrence frequencies of papers with OHSMS-standards.

Figure 2 .
Figure 2. (a) The curve illustrates the variation of the number of papers with OHSMS standards published by the 10 journals during 2006-2017.(b) Distribution of papers with OHSMS standards in association with the year of publication.

Figure 3 .
Figure 3.The pie-chart displays the distribution of papers with OHSMS standards (published by the 10 journals during 2006-2017) in association with the various fields of application.

Table 1 .
An overview of OHSMS standards.
"-UNE 81900:1996 EX: Prevention of Occupational Hazards.Rules for the implementation of a SGPRL.-UNE 81901:1996 EX: Prevention of Occupational Hazards.General Rules for the Evaluation of SGPRLs.-UNE 81902:1996 EX: Prevention of Occupational Hazards.Vocabulary.-BUNE 81903:1997 EX: Prevention of Occupational Hazards.General Rules for the Evaluation of a SGPRL.Criteria for the qualification of the Auditors of Prevention.-UNE 81904:1997 EX: Prevention of Occupational Hazards.General Rules for the Evaluation of SGPRLs.Management of audit programs.-UNE 81905:1997 EX: Prevention of Occupational Hazards.Guide for the implementation of a SGPRL"

Table 2 .
The evolution of the OHSMS standards throughout the years 1990-2018.