Health, Labour and Welfare Ministry ed., White paper on manufacturing industries (Monodzukuri) 2009 (Summary 2) (2009), Chapter 3, Section 1.
Health, Labour and Welfare Ministry ed., Basic survey of human resources development (2012), p.12 (in Japanese).
Okui, Y. and Ihara, T., An innovative proposal for operational software of production system to upgrade worker's skill, Journal of the Japan Society for Precision Engineering, Vol.73, No.1 (2007), pp.161-165 (in Japanese).
Tateno, T. and Shimizu, K., Work scheduling support in consideration of skill level and training of workers, Transactions of the Japan Society of Mechanical Engineers, Series C, Vol.73, No.734 (2007), pp.216-224 (in Japanese).
Ueda, Y., Kato, N. and Kimura, H., A supporting system for the skill acquisition from skilled persons on trial and error-type tasks, The Transactions of the Institute of Electronics, Information and Communication Engineers A, Vol. J82-A, No.5 (1999), pp.726-735 (in Japanese).