Function recovery based on program slicing

The identification and extraction of two main kinds of components, environment-dependent operations and domain-dependent functionalities, are proposed. A reference information model drives the process by giving expectations of components and their interface data. Two modified definitions of Weiser´s slicing are applied to this function recovery problem: direct slice and transform slice. Direct slice is an executable subset of the original program containing all the statements which directly contribute either to the writing on an external sink or to the reading from an external source. Transform slice is also an executable subset including all the instructions which directly or indirectly contribute to transform an external input into an external output