There are two main types of project change: change control and change management. Change control involves having a plan and process for handling changes to project requirements and scope. It is important to measure any changes against the project baseline and always communicate changes to stakeholders. Change management focuses on managing the people side of change. It involves identifying potential responses to change, communicating benefits to audiences, and using models like Kotter's 8 steps for leading change to help ensure success. Successful projects plan for and manage both types of change.