The official business definition of constraints in a project is that they are the limitations or restrictions that can affect the successful completion of a project. Constraints can be external or internal, and can include factors such as time, budget, resources, scope, and quality. External constraints are those that are imposed on the project from outside sources, such as regulations, laws, or other external factors. Internal constraints are those that are imposed by the project team, such as deadlines, budget, or scope. It is important to identify and manage constraints in order to ensure that the project is completed on time and within budget. By understanding the constraints and how they affect the project, project managers can develop strategies to manage them and ensure that the project is successful.