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Previous research has shown that trade and FDI are beneficial to countries' economic development. This paper builds on the literature, and analyzes the ef fects on total factor productivity (TFP) through three channels of openness-imports, inward FDI and international call traf fic (ICT) for a set of developing countries in Asia and Latin America and the Caribbean (LAC). Using data from the period of 1980 to 2000, I find that imports, FDI and international call traf fic all significantly promote TFP growth in developing countries, and that human capital enhances the ef fects of imports on TFP. [ABSTRACT FROM AUTHOR]