Abstract
This paper deals with the problem of reducing technical debt and modernising legacy applications, particularly COBOL heritage on 'mainframe' computers (a.k.a. 'mainframes'). The proposed approach aims at offering a solution, which is efficient through a strong relation with a cost-effective method about transformation. Indeed, literature shows both technical and scientific solutions whose economic facet is often totally ignored, letting us understand that redoing all from scratch might be cheaper, but proofs about this are urgently expected, an often missing link. Indeed, it is essential to remind that the cost of transformation is a critical concern, especially when the to-be-transformed applications rely on millions of lines of, very often, odd COBOL.
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