Abstract
This paper introduces a developed task description method which specifies the design process for robotizing assembly systems in a construction building. The task description deals with three types of information on operational objects, operational environments and operational means for the robotized operation systems. Applyin this method, basic data are available for setting robot specifications (such as robot joint configurations, length of link, and joint movement range). This paper discusses a robotization case study of temporary assembling operations for structural steel in erection work.