Boundary value analysis and equivalence partitioning both are test case design strategies in black box testing.
Equivalence Partitioning: This method is typically used to reduce the total number of test cases to a finite set of testable test cases, still covering maximum requirements
Boundary value analysis: Its widely recognized that input values at the extreme ends of input domain cause more errors in system. More application errors occur at the boundaries of input domain. Boundary value analysis testing technique is used to identify errors at boundaries rather than finding those exist in center of input domain.
Boundary value analysis is a next part of Equivalence partitioning for designing test cases where test cases are selected at the edges of the equivalence classes.
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