Knowledge management (KM) and critical success factors (CSFs) are interesting issues in the current business world. Knowledge is an important driving force for business success and competiveness, especially in the consulting industry whose core business is to sell knowledge itself. Previous works suggested a positive relation between the CSF and the success of a KM project, but only few of them related it in a quantitative way. This paper aims to identify the CSF in a consulting firm (strategic, cultural and technological factors) and to build a success model for designing KM projects based on these CSF identified. This model was tested using structured equation model. With this study we contribute to recognising the importance of these success factors in a KM project in the consulting industry to achieve the maximum success.