  Relational representation of knowledge makes it possible to perform all the
computations and decision making in a uniform relational way by means of
special relational compositions called triangle and square products. In this
paper some applications in manufacturing related to cost analysis are
described. Testing fuzzy relational structures for various relational
properties allows us to discover dependencies, hierarchies, similarities, and
equivalences of the attributes characterizing technological processes and
manufactured artifacts in their relationship to costs and performance.
  A brief overview of mathematical aspects of BK-relational products is given
in Appendix 1 together with further references in the literature.
