The paper is an attempt to define a set of fundamentals around which generic measures can be developed to assess performance of interventions in capacity building. The development of performance measures in capacity building is a complex exercise. The complexity arises from a number of conceptual and methodological issues, including the fact that the benefits associated with capacity building are not readily quantifiable and the rate of return to investment in capacity building cannot be derived without a significant margin of error. The paper notes that most measures are derived with respect to inputs, processes, outputs, outcomes/results and impacts and that there is an inordinate preoccupation with impact in the measurement of performance. Starting off with the input-process-output-outcome-impact framework, the paper presents an approach, which examines measures from the point of view of the relevance, effectiveness, efficiency, ownership, impact and sustainability of an intervention elements, which it considers as the six fundamentals in the measurement of performance in capacity building.