Functional Test Cases: Here the test Cases are designed in 
such a way that the functionality present in 
the 'Functional Design Document' are tested.

Integration Test Cases: The test cases are designed in such 
a way that, the link between the modules and the flow of 
data from one module to other modules are checked.

System Testing: Functional + Integration

User Acceptance Testing: Designing of the test cases based 
on the client (or end users) understanding.

Functional Testing:
         Testing the application whether it meets the 
functional requirements specified in the Software 
Requirement Specification documents.
         It includes object behavioural testing,Database 
testing,calculation coverage,navigation testing,error-
handling testing,Input domain coverage testing,Static text 
testing & basic functionality of the page
Integration Testing:
         Testing one or more modules together with the 
intent of finding data interface defects.
System Testing:
         System testing is conducted on overall system to 
validate whether the system meets the functional and non-
funtional requirements specified in the Software 
Requirements Specification.
User Acceptance Testing:
         This testing will come next to the system testing. 
Testing the application whether it meets customer 
requirements and expectations. Customer site people will be 
doing this testing or they will be closely involved in this 
testing.