Flexible Correct-by-Construction Programming

Correctness-by-Construction (CbC) is an incremental program construction process to construct functionally correct programs. The programs are constructed stepwise along with a specification that inherently guaranteed be satisfied. CbC complex use without specialized tool support, since it needs set of predefined refinement rules fixed granularity which additional on top the programming language. Each rule introduces specific statement and developers cannot depart from these allows develop software in structured way ensure correctness, but limited flexibility disadvantage CbC. In this work, we compare classic CbC-Block TraitCbC. Both approaches TraitCbC, related CbC, they have new language constructs enable more flexible approach. We provide for both guideline, similar leads well-structured extends by adding insert any block statements. Therefore, introduce as extension TraitCbC implements correctness-by-construction basis traits specified methods. formally prove soundness strategy. All three development qualitatively compared regarding their constructs, usability assess best suited certain tasks developers.