There are many difficulties in conceptualizing innovation in KIBS firms, and there is considerable heterogeneity among KIBS firms regarding the way in which they undertake innovation. To account for this heterogeneity of innovation forms and classifications, this chapter offers a synthesis of multiple existing forms of innovation in KIBS, provides several examples and finally summarizes the existing debate within the innovation management literature about the need to use different categories of innovation to study innovation in KIBS, services and products.