Accessability Testing (AT):

   Testing the s/w from physically challenged persons point of view.

America made one rule viz., ADA (Americans with Disabilities Act.).
Its also k.a., 508 Compliance Testing.

   It is to make sure that the s/w which is developed for end user should be used by physically challenged people as well.

   AT should be done for web based applications (Open through browser) only.

AT is a part of Usability testing. Here also we use checklists.

Sample checklists:
1. Text colour shouldnot be in red OR green colour(bcoz 0.02% people can't recognize red & green)
2. All features should be accessed through keyboad short cut
3. TAB order should work fine
4. All images should have alt tag.


To perform AT we use tools like AATT (Automated Accessability Testing Tool). The AATT tool works only for web applications.
This tools go through the html (DOM) source code and checks each & every tags/elements. 

This AATT tool checks single pages & as well as multiple pages. It is a product of PayPal. It is a open source tool.

Ex: 
If <img> tag then it checks for the presence of alt tag.
If text, label, div, span etc, it checks the colour of the text etc.


Other AT tools:
DYNOMapper.com
A11Y Compliance Platform
AATT
