The economics of upstream oil and gas play a crucial role in managing oil and gas assets, particularly in investment decision-making, asset valuation, and the general operational management of assets (Working Area/WK) for company growth. It is essential for all employees to have sufficient knowledge and understanding of the principles of economic evaluation in oil and gas, allowing them to actively engage in discussions about asset management and investment from a commercial/economic perspective. Knowledge of the business process of utilizing natural gas, which is more complex than oil resources, will complement the oil and gas economics competency. The Petroleum Economics & Gas Commercialization Training is designed to provide a foundation and essential knowledge for employees to plan, evaluate, and analyze the economics of upstream oil and gas projects. It also equips employees with basic knowledge in planning the commercialization and development of natural gas resources, including preparing working papers in accordance with best practices. This training is delivered through a combination of lectures, sharing sessions, and exercises. For the exercises, Excel software will be used as a tool. The training materials are based not only on formal publications and regulations but also on the facilitator’s experience and best practices. Exercises will be provided at the end of specific topics. The training duration is four (4) days.