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Accessibility, visually impaired, HCI,, usability, Word pad application, browser application,, email application, Facebook application


Ojuope I. K.1 , Adetunmbi A. O.2 , Oyinloye O. E.3

1Department of Computer Science, Aminu Saleh College of Education, Azare, Bauchi State, Nigeria.

2Department of Computer Science, Federal University of Technology, Akure, P.M.B. 704, Akure, Ondo State, Nigeria.

3Department of Computer Science, Ekiti State Univerversity, Ado Ekiti, Nigeria., 2, 3

ABSTRACT From the report of World Health Organization (WHO) and World Bank (2011), physically challenged persons carry a significant proportion of the world’s population, about 15%, as a result of digital divide between them and the normal individuals, they are rarely seen as a contributor to productive human capital development of the Society. Most of the Intellectually Challenged persons have little or no access to application programs’ interfaces, this is as a result of several challenges they face in accessing those interfaces. Most interfaces were developed without considering the fact that, different categories of users including people living with disabilities should be put into consideration during the requirement specification of the system. This paper focuses on the development of assistive system that will promote the user experience of the Educable category of persons living with intellectual challenges and also to compare the degree of efficiency of the assistive model with the existing ones. Theoretical framework on Human computer interaction (HCI) were also carried out and several related articles were reviewed. The design and methodology was based on the data collected from the Department of Special Education in a renowned Federal University in Nigeria. During the process of this research, we discovered that most of the works reviewed did not focus on the usability performance accuracy of systems using acceptable metrics test. The system was designed and implemented using Text / Image enlargement and text-to-speech architecture in C# programming. Concepts of World Wide Web Consortium (W3C), a global centre for web usability design standard and Web Content Accessibility Guide (WACG) for Users with Intellectual Disabilities was employed. The model was tested based on the concept of User Satisfaction / Performance Usability Metrics. The test was carried out on Effectiveness/Efficiency/Analysis of reading Errors, The Mean Percentage, Task Completion (in seconds) were used as the performance measure technique for evaluation. The result showed that the assistive model had a mean percentage performance of 98% and the mean time taken to perform a task in 32secs. The model was successful for the Educable category of people living with intellectual challenges.