A statement of work (SOW) is a formal document that defines the entire scope of work involved for a vendor and clarifies deliverables, costs, and timeline1. It serves as a contractual agreement between a vendor and a client, providing a comprehensive description of the work to be performed2. A reason to use a SOW on a project is to ensure the team stays within the scope of the contract, as it outlines what the team will and won't do on a project, saving from painful client negotiations and protecting the timeline and the bottom line3. Reference = CompTIA Project+ PK0-005 Certification Study Guide, Chapter 3: Initiating Projects Part 1, page 63; What Is a Statement of Work? Definition & Examples, Introduction and What Is a Statement of Work (SOW) In Project Management? sections; Statement Of Work Ultimate Guide: Simple Definition & Template, Introduction and What is a Statement of Work? sections; What Is a Statement of Work (SOW)? - Coursera, Introduction section.