Mergers and acquisitions are possible ways for companies to grow. During the M&A session, the acquired company will face massive changes from processes and decisions to relationships and culture. It is possible that organizational changes cause a modification to the Information System (IS) or even develop a completely new one. In fact, the main goal of an ISD is to replace an old system, whether entirely or partially. In our study, we have analyzed various organizational factors, which we found to emphasize their collective impact on the success of ISD practices to fill the research gap. Thus, we have conducted a qualitative case study where we have examined how managerial factors, organizational processes, and the social aspects of an organization, influence and are influenced by implementing IS development. Our analysis showed that, 1- the satisfaction of all participants should be considered during ISD practice. 2- task-based culture is the most effective approach for ISD practice.