Test Approach is the Strategy which decsribes the test 
team's approch to test the software both Overall & also in 
each phase.It gives better idea for the team to plan and 
execute the testing phase with perfection.
Deciding on the strategy is a complex task—one that needs 
to be made by very experienced testers because it can 
determine the success or failure of the test effort.

The implementation of the test strategy for a specific
project. It decides  how  the test strategy will be
conducted for a specific project.It typically includes the
decisions made that follow based on the (test) project's
goal and the risk assessment carried out, starting points
regarding the test process, the test design techniques to be
applied, exit criteria and test types to be performed

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