Project Managers know that cash flow is essential for the success of a project. Cash flow is the movement of money in and out of an organization, and it can make or break a project. In project management, cash flow is defined as the timing and amount of inflows and outflows of money during the course of a project. Accurately predicting cash flow can help ensure that there is enough money on hand to cover expenses, such as materials, labor, and payment to vendors. A good cash flow schedule allows a Project Manager to track progress and take corrective action when necessary.