Considerable accumulation of technological capabilities took place at Mitsubishi Nagasaki Shipyard in the pre-war period. Technology imports, within-enterprise training and in-house research played important roles in this technological learning process. New technologies were imported through appropriate channels; and they were then assimilated and improved through incremental technological changes. These, in turn, were made possible by various programmes of training and research. The combination and the evolution of the varied modes of technology imports, training and research constituted the ‘technological strategies’ of the shipyard in the pre-war period.