A Test case is individual valisation of a particular action
with inputs and clear cut expectation.test cases are
prepared from SRS.

Use case define how the application will be used by the end
user. The usecases are prepared from URS

Use cases are means of capturing functional specifications. 
Use case diagrams explains you how the business flow is. To 
be more specific it explains you the interaction between 
the actor and the system. 

Use cases may begina as brief business use cases, evolve 
into more detailed system use cases, and then eventually 
develop into highly detailed and exhaustive test cases.

In general test engineer prepares the test cases from the 
use cases in SRS & every use case describes the 
functionality in terms of input, output and process.
     Test Engineer writes the test case from the use case 
to validate the functionality. Use case consist functional 
specification (FS).



 

Regards,

Jyoti

Software Test Engineer,

JAMS Technologies PVT.LTD.

A highlevel scenario where you specify the functionality of 
the application from a business perspective. 

Whereas a testcase is:

The implementation of the highlevel scenario(usecase) 
wherein one gives detailed and step-by-step account of 
procedures to test a particular functionality of the 
application. Things get lot technical here.

Test case is derived from the test case.we can get the use
case details from the srs document where as we will do the
test design test case with generated use case information