A project is a ‘temporary effort to produce a unique product, service, or result’, and is characterized by a ‘temporary nature’ that is not permanent and has a fixed beginning and end. Closure of a project occurs when one or more of the following cases are met: The first is the achievement of the project goal, the second is the situation in which the goal is not achieved or impossible to achieve, the third is the situation where the raised funds are exhausted or no longer can be allocated to the project, the fourth is the disappearance of the need for the project, and the fifth is the lack of human or It is a situation in which material resources cannot be mobilized, and the sixth is a situation in which the project is terminated due to legal reasons or convenience. Projects put a lot of effort into delivering deliverables to the customer, and are characterized by 'uniqueness' and 'temporality' that must be completed within a set period of time. Because of the unique nature of a project, it is important to keep a detailed record of its progress. In particular, the construction industry is an industry in which experience is considered important, and when the manpower who carried out the existing project leaves, the experience is inevitably cut off. Therefore, the construction industry, which is characterized by its uniqueness, needs systematic accumulation and management of various lessons learned in the construction process. It is necessary to think about countermeasures. Therefore, this study suggests specific solutions based on the contents identified through a survey of EPC construction workers.