This study examines the strategic focus of firms, either on effectiveness or efficiency, and how this is related to their interfirm linkages. Adopting a resource-based view, hypotheses are developed about how firms adjust their interfirm linkages in response to their strategic focuses, and how this adjustment is moderated by their slack resources. The empirical evidence from survey and archival data covering 80 Taiwanese semiconductor and optoelectronics electronics firms listed on the Taiwan Stock Exchange (TSE) and Over-the-Counter (OTC) stock market, with 464 observations over the period 2005 to 2010, supports the hypotheses. In particular, the results show that firms will initiate marketing linkage partnerships when their strategic focus is efficient, but are more likely to engage in technical linkage partnerships when their strategic focus is on effectiveness. In addition, our results show that unabsorbed slack resources have a positive and significant moderating effect on the relationship between strategies that focus on efficiency and interfirm technical linkages, while absorbed slack resources have a positive and significant moderating effect on the relationship between strategies that focus on effectiveness and interfirm technical linkages.