Verifying the Functionality (external behavior) of a component or System

i) Input Domain Coverage

Verifying weather the system is accepting valid inputs or not? And

preventing invalid inputs or not

ii) Output Domain Coverage

Verifying weather the System is providing correct Outputs or not, based

on input and process

iii) Database Testing

Verifying the data validations, data storage and data retrieval operations

iv) Error handling

Verifying how the system is handling user unathurized/invalid operations

and providing error and help messages.

v) Order of functionalities

Verifying weather the System is providing correct order of

functionalities or not