Although there is extensive literature on knowledge management and its new domains and methods, there is still room to discuss the mechanism of how knowledge is disseminated and experts acquire tacit knowledge in organizations; Especially project-oriented organizations that have a different and distinct nature from routine organizations. The main purpose of this study is to provide a model of organizational requirements for the development of a knowledge handbook and also a model for the development of a knowledge handbook based on lessons learned and with emphasis on key factors in the organization. The experts are 45 managers and researchers in the field of Lessons learned and knowledge management in prominent and reputable Iranian organizations. The present study is qualitative-quantitative in terms of applied purpose and terms of the data collection method. This research has been done in two steps: the requirements for implementing the handbook and the model for compiling the handbook. Finally, both models were evaluated based on the structural equation approach with PLS software. The organization knowledge handbook implementation requirements model includes 5 main components of organizational leadership, Staff culture, technology, Staff learning, and system process, which are explained by 53 items; Also, the model of compiling the knowledge handbook of the organization includes approaches of recognizing and selecting the appropriate expert, organizing discourse sessions, reasoning the results, localization of knowledge and the phase of suggestions.