Abstract
This work designs, evaluates, and improves a proposed search engine interface for Visually Impaired VI users to efficiently perform web search activities. Our conceptual modeling technique is based on Formal Concept Analysis FCA that is used for data analysis. This approach highlights the hierarchized approach to represent the discovered concepts. It is combined with context interactive navigation in an interface which is called interactive search engine (InteractSE). This interface aims to reduce the time and effort required by the VI users to browse search results. InteractSE was evaluated by experts using Nielsen heuristics and Web Content Accessibility Guidelines WCAG 2.0 for its usability and accessibility. The analysis was carried out based on the usability problems identified and their average severity ratings. The results show that the most frequently violated heuristics from Nielsen set are consistency, documentation, and the average severity rating of all the problems is minor. The results also show that the most frequently violated WCAG 2 guidelines are distinguishable, followed by navigable and affordance. The average severity rating of all the problems found using WCAG 2 guidelines is also minor. The results show that Nielsen heuristics and WCAG 2.0 guidelines contributed to identifying several usability problems, which might have missed out if either of them was used alone.
Highlights
The web has been a blessing for people with visual impairment (VI) by allowing them to access a huge amount of information that was previously unobtainable via braille or audio interpretations
VI users interact with the interface to collect concepts as keywords that narrow the search results to get the target web pages containing the required information with the minimum effort and time required
This research presents a usability evaluation of the search interface that is developed for the VI users
Summary
The web has been a blessing for people with visual impairment (VI) by allowing them to access a huge amount of information that was previously unobtainable via braille or audio interpretations. This, in return, has supported their independence and integration in workplaces and educational settings. Despite this advancement, web pages are becoming more and more complex for a screen reader to access. The search engine results page (SERP) is a part of the web search task that contains the title, URL address and snippet for describing the web page for each result. SERP may contain other ads that cause delay for the VI users because of the screen reader’s linear approach. These challenges define the VI needs for a new web search interface that accelerates the searching process. The proposed interface should be tested with the VI for its usability
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