Although I guessed that an issue of Kaizen is not to produce defective products and improve the rate of operation, the issue of her case is totally different. She started to consider the issue from her personal point of view. As Ohno said that respect for man's life and dignity is the purpose of eliminating the wastes, this Toyota culture seems to prevail among workers.
In the factory, Ritsuko attached a rubber seal into a window frame of side doors. She had difficulty to attach it well. So Ritsuko had some defective product though others did not make defective the attachment. The team measured her grip every hour and her pushing load to a window frame to investigate the cause of her shoulder stiff.
 Ohno, T. (1988). Toyota production system. Boca Raton, FL: CRC Press.
 Tsuchiya, R. (1999, December). Case of Kaizen, volume 5. Retrieved from http://home1.catvmics.ne.jp/~qc-net/infodate/k1asinj.pdf