Slicing techniques can provide solutions to many software engineering problems such as testing, program understanding and extraction of a reusable component. However, current slicing criteria and the corresponding techniques might obtain slices that contain unnecessary statements in some situations. In this paper, we propose a new slicing technique that takes the specification of the slice into account. The information present in the specification helps to produce more precise slices by removing statements that are not relevant to the specification for the slice. Our technique is based on the weakest precondition and strongest postcondition. We present an example of applying the proposed technique in extracting a reusable component from an existing program.

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