  Critical flaws continue to exist at the level of domain, requirement, and/or
design specification, and specification verification (i.e., to check whether a
specification has desirable properties) is still one of the most important
challenges in software/system engineering. CafeOBJ is an executable algebraic
specification language system and domain/requirement/design engineers can write
proof scores for improving quality of specifications by the specification
verification. This paper describes advances of the proof scores for the
specification verification in CafeOBJ.
