In this paper, we approach the field of critical success factors (CSF) by analyzing a successful case of IT implementation within the public health sector. The purpose of the paper is to gain further understanding of if and how well CSFs can explain a successful case. The main conclusion drawn is that even though the studied organization shows signs of common CSFs, this alone cannot explain the success. An important contribution from this study is thus the focus on contextual factors when trying to understand what makes an implementation project successful.