Clarification on Implicit Knowledge by Finger Movement and Coaching Comment of the Expert in Marudai Kumihimo

Braiding techniques were often kept secret and detailed instruction about it was rarely described in the documents. Therefore, braiders needed to accumulate experience and cultivate own skill by learning through trial and error. The expert unconsciously used braiding technique learned from substantial experience. In this paper, specific behavior to the expert was investigated. And then, coaching comment of the expert was analyzed to figure out how they determine subject’s skill and transfer their own implicit knowledge. It was found that the complicated movement of fingers is one of the specific behavior to the expert and they coach the subject by explaining the differences from their movement. The difference between the expert and subject is identified by deriving from a feeling of strangeness against the subject’s behavior.