Which document acts as a source defining project characteristics and requirements?

The document that acts as a source defining project characteristics and requirements is the project plan. This plan outlines the overall strategy for executing the project and includes details such as the project's objectives, key milestones, and the resources required to complete various tasks.

While the project charter provides initial information about the project, such as its purpose and stakeholders, it does not go into as much detail regarding the specific requirements and characteristics as the project plan does. The scope document, on the other hand, typically details the boundaries of the project and what is included or excluded, but it is often part of the larger project plan.

In essence, the project plan serves as a comprehensive guide that aligns all aspects of the project, ensuring that everyone involved has a clear understanding of the objectives and requirements needed for successful project completion.