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This article develops indicators to capture six forms or types of innovation in knowledge-intensive business services (KIBS): product, process, delivery, strategic, managerial and marketing innovations. It also proposes a conceptual framework inspired by the knowledge-based theory using different categories of knowledge assets as explanatory variables. Then, based on data of 1124 small and medium KIBS, multivariate probit regression models are estimated. The results show that product, process, strategic, managerial and marketing innovations are complementary. The results also show that the different forms of innovation are explained by different explanatory variables.