Examination of the Protection O ﬀ ered by Current Accessibility Acts and Guidelines to People with Disabilities in Using Information Technology Devices

: Today, information technology (IT) products are extensively used in everyday life; however, disabled people still experience di ﬃ culties in using them. To ensure the equal use of IT products by people with disabilities, various laws / guidelines / standards have been established. In particular, Section 508 of the Rehabilitation Act, 21st-Century Communications and Video Accessibility Act, the European Accessibility Act, and the Web Content Accessibility Guidelines strongly inﬂuence IT product sales and, hence, have been included in the scope of this research. This study analyzed the main accessibility provisions / guidelines from the user experience (UX) perspective and the IT device di ﬃ culties that are addressed by the provisions / guidelines. Accordingly, the study used the IT interaction disability concept, which analyzes the comprehensive di ﬃ culties associated with the use of an IT device from the perspective of interaction, to map each task–user interface–context factor. Finally, this study suggests the aspects to be considered while establishing accessibility provisions / guidelines. Moreover, it clariﬁes the provisions and guidelines for IT product designers and developers by analyzing them from the UX perspective.


Introduction
Today, information technology (IT) products are indispensable in everyday life. People extensively use smartphones, connected televisions, personal computers, and tablets nowadays and are expected to use even more IT devices in the future because of the widespread popularity of the Internet of Things [1][2][3]. However, despite the rapid growth in the use and number of IT devices, some people experience difficulties while using such devices.
Digital literacy is an important requirement for people to efficiently use IT devices; also it refers to the ability to understand the content of information received through IT devices and transform this information to different formats for specific purposes [4,5]. The unequal distribution of digital literacy causes the digital divide, resulting in the alienation of some people from IT devices. The digital divide refers to the economic and social imbalances between those who have access to IT and those who do not [6,7]. In general, the economic and social inequalities resulting from the digital divide severely affect the life of people with physical or mental disabilities [8]. Particularly for users with physical and mental disabilities, digital literacy is directly associated with the individuals' user experience (UX) accessibility. In this case, accessibility refers to the characteristic of a product or system that enables its use by people with disabilities [9][10][11][12]. When the product's accessibility level is low, people with disabilities find it difficult to use the product. Further, people with disabilities lack digital literacy system that enables its use by people with disabilities [9][10][11][12]. When the product's accessibility level is low, people with disabilities find it difficult to use the product. Further, people with disabilities lack digital literacy and eventually experience the inequality caused by the digital divide. Therefore, to bridge the digital divide experienced by people with disabilities, it is necessary to increase IT devices' accessibility and, thereby, improve the people's ability to use IT devices.
Worldwide, many acts, guidelines, and standards pertaining to accessibility have been suggested to compensate the digital divide experienced by people with disabilities [13]. In the United States, which is one of the world leaders in the enactment of accessibility laws, the Americans with Disability Act [14] and Section 508 of the Rehabilitation Act of 1973 (hereafter, Section 508) [15] are particularly important. Subsequently, the 21st-Century Communications and Video Accessibility Act (CVAA), which was established in the era of President Obama, was first enacted in 2010 [16]. Subsequently, the European Accessibility Act (EAA) of 2019 was established [17]. Further, the Web Content Accessibility Guidelines (WCAGs) established in 1999 were updated to version 2.1 in May 2018 through continuous revision [18]. Currently, efforts are underway to establish/revise accessibility standards. Starting with the "Guidelines for standards developers to address the needs of older persons and persons with disabilities" developed in 2001 [19], such efforts have been progressing with particular focus on new products/services.
The purpose of this study is to analyze the major legal provisions and guidelines related to accessibility from the UX perspective. Accordingly, the study analyzes the primary accessibility provisions/guidelines related to IT devices and services using the concept of IT interaction disability (ITID) to determine the difficulties addressed by these provisions/guidelines. Section 2 introduces the ITID concept and task-interface-context (TIC) framework, which depicts the difficulties faced by people when using IT devices. From the UX perspective, ITID is a suitable concept for accessibility analysis because it recognizes the difficulty of using IT devices in terms of interaction. Section 3 reviews several important accessibility provisions, guidelines, and standards, and Section 4 introduces the process of ITID classification by analyzing detailed provisions and guidelines. Further, Section 5 presents the results of the ITID derived from Section 4 analyzed using task, user interface, and context. Finally, Section 6 discusses the research results and Section 7 presents the study's conclusions.

Introduction to ITID
ITID refers to the comprehensive difficulty experienced by people while using an IT device, and this difficulty encompasses not only the situation of using media content but also the difficulties that arise when using the IT device's hardware and software, as shown in Figure 1 [3]. This suggests a new perspective for accessibility, in terms of interaction using products, rather than individuals' physical or mental disabilities. Figure 1. Depiction of the information technology interaction disability and task-interface-context framework. Figure 1. Depiction of the information technology interaction disability and task-interface-context framework.
Electronics 2020, 9, 742 3 of 15 Digital literacy is a concept similar to ITID that indicates whether a user can communicate by recognizing information from a digital platform. It mainly focuses on the lack of reading skills of visual details, navigation skills, and search skills, which are cognitive skills that require the use of digital information [4]. Some similar concepts include computer literacy [20], media literacy [21], and Internet literacy [22]. ITID considers the cognitive aspects of digital literacy, as well as individuals' sensing difficulties and actionability in using digital products. In other words, ITID reflects not only cognition-related disorders but also challenges experienced by users with sensing or action-related disorders. Table 1 depicts the five attributes of ITID [3]. They are about which difficulties that arise when using IT devices are included in ITID. For example, a user has difficulties when using a smartphone, but if he/she can use it quite well through the text to speech function, it is not included in the ITID category due to the attribute number B ( Table 1). The five difficulties in Table 1 can create a digital divide by impeding people with disabilities' use of IT devices and, ultimately, depriving these people of the economic and social benefits of using such devices. Therefore, the ITID attributes can create inequities in the use of IT devices by people with disabilities. ITID is divided into four types, of which classify the characteristics of the ITID. ITID on sensing refers to difficulties experienced in obtaining information from sensory periods, such as sight, sound, and touch. Further, ITID on cognition implies a difficulty in analyzing the information obtained from sensory organizations, such as understanding and interpretation, through an information-processing process. Finally, ITID on emotion is a difficulty in recognizing and interpreting emotions, and ITID on action is the difficulty in performing the IT device's functions and is related to the user's ability to operate the equipment. Four types of ITID are highly linked with conventional disability types. Table 2 shows the relationship between four types of ITID and disability types. Table 2. ITID and disability types.

ITID Types Relevant Disability Types
ITID on sensing sensory disability ITID on cognition specific learning disability, digital illiteracy, intellectual disability ITID on emotion emotional disability ITID on action physical disability, speech disorder, language disorder ITID, information technology interaction disability.

Task-Interface-Context Framework
The TIC framework involves three components: tasks, user interface elements (UIEs), and context factors ( Figure 1). The main characteristic of ITID is that users can experience it when they perform "tasks" while interacting with the UIEs of IT devices in a certain context. By combining these three components, the types of ITID can be classified systematically. For example, "Significant difficulty in seeing visual information on the screen outside in bright sunlight" can be classified into "Receive" Electronics 2020, 9, 742 4 of 15 × "Visual information" × "Outside and light levels" using the TIC framework. The International Classification of Functioning, Disability and Health (ICF) is the World Health Organization's framework for understanding functioning, disability, health-related states, outcomes, and determinants [23]. Relevant ICF codes were added in Tables 3-5.   Tasks can be defined as the observable units of activities that are performed to achieve a goal [24,25]. The task taxonomy was analyzed using the following procedures: (1) Collecting tasks by conducting literature reviews from human computer interaction, literacy, activities of people with disabilities, and hedonic experience; (2) selecting important tasks by conducting an expert survey with the help of five hands-on UX experts in a Korean IT company; (3) verifying an IT device task taxonomy using IT device user guides; and (4) analyzing an IT device task taxonomy. Table 3 depicts an IT device task taxonomy.
UIEs are the components of IT devices in which interactions occur while users perform tasks using the devices [26]. They hierarchically comprise hardware (the physical part) and software (the logical part) ( Table 4). The hardware of UIEs of IT devices is further classified into user input components, system output components, and the main body of the device [27,28], whereas the software of UIEs comprises the programmed elements that appear on a display panel [26]. The software of UIEs is composed of three parts: informational, functional, and structural items.
Further, context is defined as a set of conditions that influences users' interaction with a device [29]. Contextual taxonomies were developed by surveying the context factors that influence the UX of IT devices [30,31] and situationally-induced impairments [32,33]. Table 5 presents the contextual taxonomies of IT devices.

Literature Review on Accessibility Acts/Guidelines/Standards
To date, various accessibility provisions, guidelines, and standards have been enacted or revised worldwide, and specific guidelines are used for specific purposes (Table 6). Guidelines for standards developers to address the needs of older persons and persons with disabilities [19] 2001 It summarizes the requirements for usability and accessibility of the elderly and people with disabilities and analyzes the aspects to be considered when designing the actual product and service Ergonomics of human-system interaction-Part 20: Accessibility guidelines for information/communication technology (ICT) equipment and services [40] 2008 Guidelines to improve the accessibility of ICT equipment and services for use at work, in the home, and in mobile and public environments Information technology-Accessibility considerations for people with disabilities-Part 1: User needs [10] 2009 Division of user requirements into 16 types, and summarization of detailed requirements for specific disabilities (blind, low vision, deaf, hard of hearing, physical disabilities, and cognitive/language/learning disabilities) Information technology-Accessibility considerations for people with disabilities-Part 2: Standards inventory [41] 2009 Identifies a collection of standards that satisfies the needs of people with disabilities from part 1 Information technology-Accessibility considerations for people with disabilities-Part 3: Guidance on user needs mapping [42] 2009 Guidance on the mapping of a set of user needs with the provisions of a particular standard, technical report, or set of guidelines Information technology-W3C Web Content Accessibility Guidelines (WCAG) 2.0 [43] 2012 Implemented WCAG 2.0 as an ISO standard to ensure its utilization by more developers, policy-makers, and managers Ergonomics-Accessible design-Accessibility of information presented on visual displays of small consumer products [44] 2020 Designed guidance on the accessibility of visually presented information on small displays for older people and people with disabilities Ergonomics-Accessible design-Controls of consumer products [45] 2020 Accessibility requirements and recommendations for controlling consumer products for older people and people with disabilities ISO, International Organization for Standardization.

Accessibility Acts
The United States and Europe are regions with strong accessibility legislation regarding the use of IT devices. In the United States, accessibility is determined by various laws for different purposes, including the 21st CVAA, Section 508, and Section 205 of the telecommunications act. In the United States, Section 508 regulates the rights of accessibility for IT devices, which are from a federal agency (e.g., web sites, software, and computers) [15]. In other words, according to Section 508, when federal agencies develop, procure, maintain, or use electronic technology and IT, federal employees with disabilities should have comparable access to and use information and data as the federal employees without disabilities. Further, Section 255 of the communications act (hereafter, Section 255) [34] requires telecommunications equipment and services to be accessible to, and usable by, individuals with disabilities. On January 18, 2017, the access board issued an "Information and Communication Technology (ICT) Standards and Guidelines" that updated the accessibility requirements for ICT based on Sections 508 and 255 [15]. It encompassed hardware, software, electronic content, and support documentation, as well as services accessible to people with disabilities. The major changes introduced by this documentation were as follows: Rather than merely describing product types, the documentation restructured provisions to suit the multifunctional capabilities of ICT products and added Levels A and AA of WCAG 2.0. Further, more obstacles could be covered by including provisions that considered cognitive, language, and learning disabilities. In addition, the 21st CVAA of 2010 was continuously enacted to ensure people with disabilities' access to modern IT devices [16]. The 21st CVAA is particularly appropriate in this respect since it influences the import, shipping, or sale of digital apparatus in the U.S. market. Hence, IT service or hardware operators who have entered the U.S. market are currently providing accessibility functions in conformance with the provisions of 21st CVAA. The act is divided into two titles: Title 1 includes guidelines related to communication products and services connected to data, and title 2 encompasses guidelines associated with watching videos on television or the Internet. In December 2016, the "requirements for accessibility of digital apparatus functions," which detail 11 specific functions related to video that should be followed by digital apparatus manufacturers, came into effect. Related items include volume adjustment and mute functions, closed captioning options (e.g., configuration of the font size, font color, and opacity), and playback (e.g., play, stop, and pause) functions. In Europe, a new EAA will be newly passed in the EU Member States in 2020 and shall be enacted as early as 2025 [17]. The European Commission, which is responsible for making proposals for new European legislations, has proposed this act to prevent the occurrence of any obstacles to the use of products, services, and infrastructures by persons with disabilities in Europe. Further, the EU member states have established different accessibility legislations for each country, and the aforementioned EAA is the first attempt to ensure the congruity and consistency of accessibility in Europe. Consequently, manufacturers and service providers have found products and services that comply with EAA. It is easier for them to export such products to other EU member states and, thereby, people with disabilities receive highly accessible products and services at very competitive prices. The EAA's range of products and services includes consumer hardware and operating systems, self-service terminals (e.g., automated teller, ticketing, and check-in machines), consumer equipment used for electronic communication services and audiovisual media services, and e-readers.

Accessibility Guidelines
With the advent of the Internet in the 1990s, the term World Wide Web (or simply, web) became popular. Since the Internet enables people to carry out diverse activities, including communication, business, and leisure activities, it influences people's social culture, economic status, politics, and personal relationships [46]. People with disabilities are one of the most vulnerable groups for social exclusion, and web accessibility has been helping these people to perceive, understand, navigate, interact with, and contribute to the web. The WCAG is intended for web content, web authoring tool, and web accessibility assessment tool developers. Accordingly, WCAG 1.0 was developed in 1999, and WCAG 2.1 was established in 2018 to develop more advanced technologies and remains relevant to this day [18]. The WCAG considers a comprehensive set of disabilities, including blindness and low vision, deafness and hearing loss, learning disabilities, cognitive limitations, limited movement, speech disabilities, photosensitivity, and combinations of these conditions. WCAG 2.1 has four principles, 13 guidelines, 78 success criteria, and several techniques to develop web content. Among them, principles are the most important aspects, and they highlight perceivability, operability, understandability, and robustness of IT devices. The guideline is a goal that helps individuals to easily access web information; it is not testable, but helps you understand success criteria. The success criteria can be tested to ensure that the website complies with web accessibility requirements. These criteria involve three levels: A (lowest), AA, and AAA (highest). Since WCAG is a very important international guideline, various tools that automatically analyze web accessibility according to the current WCAG have been developed, as well [46].
In addition, accessibility guidelines have been developed for designers and developers in each web development company. For instance, Apple developed the design guideline that must be considered in the design of an iOS app [35] and the UI kit accessibility for iOS app developers [36]. Google developed detailed guidelines for material design and instructions for Android developers [37,38]. Moreover, Samsung developed guidelines for UX designers, which are used in designing accessibility functions in Samsung products [13]. Finally, for BBC, guidelines related to mobile web contents and mobile apps have been developed [39]. Characteristically, iOS, Android, and HTML are divided, and program codes to develop each accessibility function are summarized.

Accessibility Standard
The International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) facilitate the international exchange of goods and services and standardize the promotion of cooperation in the intellectual, scientific, and economic fields. Each standard document developed in this manner has the advantage of being easy to use in collaboration with other international organizations. In terms of the accessibility of IT devices, various international standard documents have been and are being developed continuously. Table 6 depicts the standards that are directly related to the accessibility of IT devices and services. In the 2000s, documents on people's accessibility to comprehensive IT devices, such as the ISO/IEC Guide 71 and ISO/IEC TR 29138, were produced. In 2020, detailed accessibility documents focusing on specific user interfaces of IT devices, such as visual displays of small consumer products or controls of consumer products, are being developed. However, since the standard has no legal effect, it provides only limited protection to people with disabilities who use IT devices.

Analyzing Provisions Related to IT Devices/Services
The current study analyzes the existing accessibility provisions, guidelines, and standard documents that address the difficulties faced by people with disabilities in using IT devices. Among the various provisions, guidelines, and standard documents listed in Table 6, this study set the target range for CVAA, Section 508, EAA, and WCAG. This is because the four types of documents have strong legal effects so that the inequality in the use of IT products is insufficient to affect the sale of IT products and services. Due to the same reason, that standards that solely promote communication in non-legal and unified terms are not included in the study's scope.
In this study, Section 508 is analyzed based on the "Information and Communication Technology (ICT) standards and guidelines," which was updated in January 2017. The scope was determined for Chapter 3 (functional performance criteria), Chapter 4 (hardware), and Chapter 5 (software) in the guideline document, which were considered suitable for IT devices. An analysis of CVAA considered Title 1 (communications access) and Title 2 (video programming) and included the "requirements for accessibility of digital apparatus functions," which came into effect in 2016. For the EAA, the rules for user interface and functionality design specified for each product and service "from Section 1 to Section 7" were covered. The rules detail the items that each product or service must provide for accessibility. The EAA referred to "user interface and functionality design" in Section 1 (General accessibility requirements related to all products covered by this directive in accordance with article 2 (1)) of Annex 1, which was updated on April 7, 2019. Similarly, WCAG 2.1 covered the success criteria of all WCAG 2.1 levels, that is, Levels A, AA, and AAA. Through this process, 179 regulations (62 in Section 508, 24 in CVAA, 78 in WCAG, and 14 in EAA) were derived.

Classification of ITID According to Regulations
The detailed regulations of the collected provisions and guidelines were mapped to ITID's TIC framework. Accordingly, the study derived 187 ITIDs-62 for rehabilitation, 24 for CVAA, 80 for web, and 21 for EAA. The following rules guided the mapping process: First, relevant provisions and guidelines were analyzed based on ITID, a difficulty that occurs when using IT devices. The physical and mental vulnerabilities that characterize people with disabilities may create problems in their use of IT devices, which, in turn, causes inequalities in life in terms of, for example, information acquisition and leisure activities. Since these three types (i.e., the physical and mental vulnerabilities, difficulties in using IT devices, and inequalities in life) are mixed in the provisions and guidelines, ITID was established as the scope of this study (Figure 1). For example, the statement "The same degree of privacy of input and output shall be provided to all individuals" of the Section 508 was analyzed outside the scope since it was judged on inequality in everyday life and part of a regulation to protect privacy.
Second, if related provisions and guidelines state that a certain function should be entered, the function is judged difficult to use and the mapping is focused on the function. For example, in the "Small Entity Compliance Guide" of CVAA [47] (p. 5), "A digital apparatus manufacturer must make functions that are used for the reception, playback, or display of video programming accessible to individuals who are blind or visually impaired. Power On/Off: Function that allows the user to turn the device on or off." In this case, the purpose of providing a "voice support function" for people with blindness or visual impairments is to prevent all users from using the "power on/off" function. Therefore, it is mapped as an "activate-functional item".
Third, for a guide format, the mapping was conducted by inferring the ITID for the guidelines to protect. For example, in the Section 508 (p. 5837), "302.7. With Limited Manipulation. Where a manual mode of operation is provided, ICT shall provide at least one mode of operation that does not require fine motor control or simultaneous manual operations." Since exerting fine motor control and ensuring simultaneous manual operation is difficult, it is mapped as a "manipulate-functional item".
Finally, when one regulation is analyzed by multiple ITID difficulties, it is mapped to multiple items. For example, the statement "2.2.3. Timing is not an essential part of the event or activity presented by the content, except for non-interactive synchronized media and real-time events" in WCAG refers to disabilities such as blindness, low vision, cognitive/language disabilities, deafness, and physical disabilities. Further, this regulation is applicable to all disabilities. In the case of blindness, low vision, cognitive/language disabilities, and deafness, the regulation was mapped to understand-visual information because visual information is related to difficulties in understanding caused by the lack of time. In the case of people with physical disabilities, it was mapped as an "activate-functional item" because the time to select a specific menu was insufficient.

ITID from the Task's Perspective
All the 187 derived ITIDs were mapped to the task. For each task category, 88 ITIDs were analyzed for sensing, 30 for cognition, 57 for action for information interaction, and 12 for action for physical device setting. Table 7 depicts the number and provision of ITIDs for each task. Finally, Figure 2 presents the numbers of tasks mapped to ITIDs for each method.

ITID from the Perspective of UIEs
A total of 178 ITIDs were mapped to a UIE, and nine ITIDs were not mapped to the UIE. All the unmapped ITIDs were related to ITIDs in assistive technology functions or assistive products. There were 13 and 165 hardware-and software-related ITIDs, respectively. The ITIDs related to informational items were the most frequent, and the visual information was 74, as well. Table 8

ITID from the Perspective of UIEs
A total of 178 ITIDs were mapped to a UIE, and nine ITIDs were not mapped to the UIE. All the unmapped ITIDs were related to ITIDs in assistive technology functions or assistive products. There were 13 and 165 hardware-and software-related ITIDs, respectively. The ITIDs related to informational items were the most frequent, and the visual information was 74, as well. Table 8 depicts an example of the numbers and provisions of ITIDs for each UIE, and Figure 3 reveals the numbers of UIEs mapped to ITIDs in each method.

ITID from the Context Perspective
Ten ITIDs were mapped to the context factor. Further, the study analyzed two user-related, four environment-related, and five device-related ITIDs. Table 9 depicts the numbers and provisions of ITIDs for each context, and Figure 4 reveals the numbers of context factors mapped to ITIDs for each method. Table 9. Numbers of provisions for each context factor.

ITID from the Context Perspective
Ten ITIDs were mapped to the context factor. Further, the study analyzed two user-related, four environment-related, and five device-related ITIDs. Table 9 depicts the numbers and provisions of ITIDs for each context, and Figure 4 reveals the numbers of context factors mapped to ITIDs for each method.

Discussion
Based on four major accessibility provisions and guidelines, this study examined the ITIDs that existing legal provisions and guidelines protect against to ensure the equal use of IT devices by people with and without disabilities. The TIC framework was used to perform analyses by task, UIEs, and context factors. For each task category, approximately 47% of all ITIDs related to sensing, 16% related to cognition, 31% related to the action for information interaction, and 6% related to the action for physical device settings were found. Further, for each task, the aspects receive (81), recognize (16), control (14), activate (11), and choose (10) were mapped the most (Table 7).
It is seen that the four types of provisions and guidelines that were analyzed consider the ITID on sensing to be the most important. Further, the study confirmed that the provisions and guidelines related to ITID on cognition were very small and additional provisions and guidelines must be developed to suit the continuous emergence of new IT devices. For example, for interactive speakers such as Amazon Echo and Microsoft Alexa, the main point of interaction is interpreting information with auditory information alone, without visual elements. Since the interactive speaker possesses only auditory features, it can provide useful functions for the visually impaired but cannot enable indepth interaction. When you raise a request to search for a restaurant, you may experience difficulty in recognizing restaurant-related information when listening to the speaker's voice alone, comprehensively understanding rating information, and remembering various details pertaining to locating the desired place. Therefore, the study suggests the importance of adding regulations for ITIDs related to learning and remembering, which are not protected by existing provisions and guidelines. Earlier studies have often mentioned difficulties related to learning and remembering. For instance, Kim and Han [3] derived the ITID related to learning in smartphone use, as follows: "I cannot use some programs (e.g., iTunes in iPhone) because it is too difficult to learn."

Discussion
Based on four major accessibility provisions and guidelines, this study examined the ITIDs that existing legal provisions and guidelines protect against to ensure the equal use of IT devices by people with and without disabilities. The TIC framework was used to perform analyses by task, UIEs, and context factors. For each task category, approximately 47% of all ITIDs related to sensing, 16% related to cognition, 31% related to the action for information interaction, and 6% related to the action for physical device settings were found. Further, for each task, the aspects receive (81), recognize (16), control (14), activate (11), and choose (10) were mapped the most (Table 7).
It is seen that the four types of provisions and guidelines that were analyzed consider the ITID on sensing to be the most important. Further, the study confirmed that the provisions and guidelines related to ITID on cognition were very small and additional provisions and guidelines must be developed to suit the continuous emergence of new IT devices. For example, for interactive speakers such as Amazon Echo and Microsoft Alexa, the main point of interaction is interpreting information with auditory information alone, without visual elements. Since the interactive speaker possesses only auditory features, it can provide useful functions for the visually impaired but cannot enable in-depth interaction. When you raise a request to search for a restaurant, you may experience difficulty in recognizing restaurant-related information when listening to the speaker's voice alone, comprehensively understanding rating information, and remembering various details pertaining to locating the desired place. Therefore, the study suggests the importance of adding regulations for ITIDs related to learning and remembering, which are not protected by existing provisions and guidelines. Earlier studies have often mentioned difficulties related to learning and remembering. For instance, Kim and Han [3] derived the ITID related to learning in smartphone use, as follows: "I cannot use some programs (e.g., iTunes in iPhone) because it is too difficult to learn." "I want to use the voiceover function, but it is too difficult for me to learn how to use it." In addition, according to a study by Kim et al. [48], people with visual impairments sometimes memorize and use an interface layout when using a smartphone camera application. For example, the study collected the following comments: "Even though I am a person with low vision, I remember the layout of menus and the sequence of menus first." The current study found no provisions and guidelines related to ITID on emotion. Although ITID on emotion significantly influence users' UX while operating IT devices, it is not considered to cause inequality in everyday life. However, many of the contents of IT devices are entertainment contents, and the affective satisfaction of IT devices/services is one of the main UX factors [49,50]. Further, on considering the usability problems discussed by Kim et al. [48], we understand that many emotion-related issues such as "screen reader voice unfriendly" and "beeping sound pitched too high" were collected. Therefore, in future studies, it will be necessary to consider the enactment of laws related to ITID on emotion.
For each UIE category, the hardware issue was 7%, whereas the software issue was 93%, which mostly comprised ITID related to software. Among software, information items were 125, among which 74 ITIDs related to visual information were derived. The presence of significant volumes of visual information is inferred from the fact that most of the current provisions and guidelines address the difficulty experienced by people with visual impairments in using IT devices. Thus, when UX designers develop new UX functions/services, visual information elements should be designed considering accessibility.
Regarding context factors, only 10 ITID mappings were analyzed, which is a very small number. Since provisions and guidelines are expected to comprehensively prevent inequality, it is considered that there are only a few cases that include context. However, based on the findings of earlier studies that reveal the difficulties faced by many people with disabilities in the use of IT devices in walking and paying situations, there is a need to enact relevant provisions and guidelines in a timely manner [3,51]. Therefore, the existing provisions and guidelines do not cover all the ITIDs experienced by people with disabilities when using various types of IT devices. The efficient collection of data on ITIDs experienced by users with disabilities through various methods will be helpful in the future enactment of provisions and guidelines that aim to prevent inequality. Further, accessibility designers should examine whether the relevant functions are sufficiently highlighted in products and services based on the ITIDs specified by existing provisions and guidelines. If new accessibility functions are developed for different tasks, UIEs, and context factors that have hitherto not been considered, more innovative features can be developed.

Conclusions
To our knowledge, this study is the first endeavor to analyze the existing accessibility provisions/guidelines from the perspective of UX. Based on four types of provisions and guidelines (Section 508, CVAA, EAA, WCAG), the study derived 179 regulations related to IT devices and services. We classified the ITIDs experienced by users for each regulation and analyzed 187 such ITIDs. Through this study, we could understand the types of ITIDs currently protected by provisions and guidelines and infer the direction in which protection should be established in the future. The difficulties related to ITID on sensing comprised approximately 47% of all the ITIDs, and the problems associated with information reception were the most protected ones. Software-related UIEs, among which visual information ranked the highest, confirmed that provisions targeting people with visual impairments were the most extensive. Further, the total number of ITIDs in the context was confirmed to be 10. In addition, the study analyzed provisions and guidelines from the UX perspective and provided IT product designers and developers with an understanding of relevant provisions and guidelines. The accessibility provisions and guidelines comprise accessibility functions or requirements that must be satisfied by IT devices. Therefore, knowledge on relevant provisions and guidelines is helpful in developing or evaluating new accessibility functions. In the future, the same process will be conducted based on various ISO documents, following which the aspects covered by standard documents will be confirmed. In order to comprehensively study the attributes and types of the ITID concept, further research is needed for users with ITID experiences, such as the disabled and the elderly.