hi all..my boss assign new task that is to test embedded hardware which i have not design the schematic...he told about 3 stages of testing...
1). principle code testing.
2) development code testing.
3) system code or user code testing.
i don't know what these 3 testing stages means ...can anyone explain me these things or provide some useful links...i did google seach also but didn't get anything...so i request u all provide some info r defination for these testing stages...

thanks all waiting for ur replies...

 

principle testing:Validate the primary debug interface (UART) is performing as per the requirment.
development testing:Validate the all the sub modules individually as well as an integarted system.
system testing: Validate the transmitter for the user requirement.