Some differences in changes of building parts and building systems are observed in manufacturers, technicians and contractors. As for sanitary equipment, various changes are recognized in the developments at Housing and Urban Development Corporation and private sanitary equipment enterprises. On our published papers, we grasped the change of development of the two cases. Also, we found the way of systematization for developmental processes to make easy comparison them. As a result of comparison, the developments of two cases were approximately similar in the first stage, but different in next stages.
