Boundary value analysis & Equivalent Class partitioning only for the validation?

Hi,

Boundary value analysis & Equivalent Class partitioning are the test cases design stretigies.
Can anybody tell me ? These are used only for the validation type of test cases?

Please help.

I didn't find the right solution from the Internet.

References:
http://www.sqaforums.com/forums/general-...validation.html
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Thanks