Purpose -The purpose of this paper is to compare the competitiveness of the economies of Taiwan and Korea. Design/methodology/approach -The comparison between Taiwan and Korea is based on the average value of the data over five years (2000)(2001)(2002)(2003)(2004). It applies a generalized double diamond model approach to analyse the overall competitiveness of these two small open economies. Findings -Taiwan surpasses Korea in all decisive factors with the exception of the demand condition in the domestic diamond in the years 2000-2004, which is due to Korea's population being more than double Taiwan's. As to the international diamond, Taiwan enjoys comparatively high competitiveness, and its international diamond is better than Korea's in all four parts. Research limitations/implications -The data sources include: Indicators of Science and Technology, Taiwan, 2004 and 2005, Korean National Statistical Office and related statistical data obtained from various government agencies, including data on factor, demand, firms strategy, structure, and rivalry covering the period from 2000 to 2004, whereas related and supporting industries only covered the years 2000-2003. Originality/value -This is the first paper to apply a generalized double diamond model approach to analyse and to compare the competitiveness of the economies of both Taiwan and Korea. Its empirical evidences and policy implications is of interest to academicians, government officials, and business managers.