1.Regression: Testing the application/system after the bug 
fix to check whether the  bug fix affecting the remaining 
functionality of the application.
This test will be conducted on every build when previous 
bugs are resolved in that build.
Retesting: Re-execution of alltest cases after receiving
             every build.This will provide confidence all 
             the good working features of previous build 
             are working fine.
2.Usability Testing:Testing application how user friendly 
                    when user using it.
3.Functionality testing:Testing each functionality of the 
                        application.
4.basis to write the test cases:
 
 Generally we refer SRS(software requirement document) to 
 write testcases.
 
 To under stand Flow of trasactions we will refer the flow
 diagrams.
 
 To write the GUI test cases we will refer the model screen 
 shots(normally provided in Design document)
 
 For database test cases we will refer the database tables
 defnitions in SRS document.
5.If the testing is done by Automation tool then we should
  write or record test scripts using automation tool.
6.Configuration management tool like VSS or Just we will
  keep it as share document.
7.Manually one by one by seeing the excel test case 
  document or by using any automation tool.
8.Normally testers won't involve in requirement
  preparation.  
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rajendra
rajendra_penumalli@yahoo.com