It's a US law applicable to government agencies, but the principles may be applied to any software requring access for people with disabilities. The key areas are: compatibility of software with screen reading software, and other accessibility aids (e.g. the standard Windows ones), compatibility with high contrast/large font display settings, and the ability of the software to be controlled by keyboard only, not the mouse.
Thanks for the reply. We prepared a check list according to the Section 508 and we are testing the application W.R.T check list. In the Test case generation, we are just writing the flow of the screen. My question is "IS IT SUFFICIENT TO WRITE THE SCREEN FLOW... ELSE In Addition to this, WHAT CAN WE MUST TAKE CARE DURING THE TEST CASE GENERATION"