Scrum is an iterative, incremental process for developing any product or managing any work, commonly used with agile software development. It produces a potentially shippable set of functionality at the end of every iteration.

Benefit:
• Flexibility and Speed.
• Reduces the risk.
• High quality and low cost.

Cheers ,
Mahesh R 

A test strategy is a planning document that provides the overall direction for the software testing needs of a project. Developing a test strategy is about setting direction and resolving high-level testing questions. The value of the test strategy isn’t in the wording, the writing, or the format of the strategy; the value is in planning an approach for testing.

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Equivalence partitioning:

Equivalence Partitioning determines the number of test cases for a given scenario.
Equivalence partitioning is a black box testing technique with the following goal:
1.To reduce the number of test cases to a necessary minimum.
2.To select the right test cases to cover all possible scenarios.