The easiest and cheapest time to alter the information system is in the planning phase. During the planning phase of the information system development life cycle,
any changes or alterations to the system can be easily implemented without incurring significant costs. This is because the planning phase involves identifying the requirements, objectives, and scope of the system, which allows for flexibility in making changes before the actual development and implementation phases begin. Additionally, making alterations during the planning phase helps to avoid costly rework or redevelopment later on.