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The reduct, originating from the Classic Rough Set Approach (CRSA), is an inclusion minimal subset of attributes that provides discernibility between objects from different classes in at least the same degree as the set of all attributes. It can be thus referred to as being consistent and minimal, which are the two important characteristics of filter-based feature selection. These two characteristics have been also utilized to define reducts within the Dominance-based Rough Set Approach (DRSA). Further, the classic reduct, here referred to as an inter-class reduct, has evolved into what is known as intra-class reduct and construct in CRSA. The idea is that while inter-class reducts utilize only one part of information generated from all pairs of objects, intra-class reducts utilize the remaining part, while constructs utilize both. The paper delivers a final unification of inter-class reducts, intra-class reducts and constructs across …