By preparing a preliminary cash flow schedule, project managers can better understand what?

Preparing a preliminary cash flow schedule allows project managers to gain insight into the cash needed at various disbursement intervals throughout the project. This schedule outlines the timing and amounts of cash inflows and outflows, enabling managers to anticipate when they will need funds for specific expenses, such as materials, labor, and subcontractor payments.

By using this cash flow schedule, project managers can ensure that cash is available when required, helping to avoid delays due to the unavailability of funds. It also assists in financial planning, ensuring that resources are allocated wisely and that the project remains financially viable throughout its duration.

The other options may be relevant aspects of project management but do not directly address the primary purpose of a cash flow schedule. Total project cost encompasses broader elements beyond cash flow timing, the number of employees required focuses on labor aspects which are not necessarily reflected in cash flow, and the timeline for project completion is more related to the project schedule rather than the financial aspects of cash management.