Resumen: This study examines the use of information technologies (ITs), IT human capital, the level of IT vendor support, and their joint effects on firm''s sensing and responding to IT changes (technological opportunism). Using data from the U.S. and Spain, the results suggest that IT use and the firm''s IT human capital are the main drivers of technological opportunism (TO). The effect of IT vendor support on TO is country dependent, with a U-shaped effect in the U.S. and no effect in Spain. IT vendor support can have positive effects on TO if the firm invests in IT human capital. Idioma: Inglés DOI: 10.1016/j.im.2016.02.002 Año: 2016 Publicado en: INFORMATION & MANAGEMENT 53, 5 (2016), 654-667 ISSN: 0378-7206 Factor impacto JCR: 3.317 (2016) Categ. JCR: COMPUTER SCIENCE, INFORMATION SYSTEMS rank: 24 / 146 = 0.164 (2016) - Q1 - T1 Categ. JCR: MANAGEMENT rank: 32 / 194 = 0.165 (2016) - Q1 - T1 Categ. JCR: INFORMATION SCIENCE & LIBRARY SCIENCE rank: 11 / 85 = 0.129 (2016) - Q1 - T1 Factor impacto SCIMAGO: 1.55 - Information Systems (Q1) - Management Information Systems (Q1) - Information Systems and Management (Q1)