At assembly work sites, motion analyses are carried out to identify the causes of time variations. It is, however, difficult to apply these analysis methods to operation which the value-adding motions are unclear such as wire harness work. This paper firstly summarizes motion analysis methods in the traditional industrial engineering field and then discusses an analysis method focusing on fundamental material changes. This paper takes a wire-harness assembly work as an example, applies the Monokoto analysis to this work to clarify the value-adding motions, and discusses how to expand motion analysis and Therblig analysis to such work. This paper finally applies this thought to an actual work and discusses the effectiveness.

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