Washington Annual Authorization for Public Works Project — 4/10 Work Agreement is an agreement between the state of Washington and the contractor to perform specific works on public works projects. This agreement outlines the mutual responsibilities of both parties and provides the contractor with the authorization to proceed with the work. The agreement outlines the scope of the project, the project timeline, the cost and payment structure, and other relevant terms and conditions. There are two types of Washington Annual Authorization for Public Works Project — 4/10 Work Agreement: 1) Design-Bid-Build and 2) Design-Build. The Design-Bid-Build agreement is a traditional approach to public works projects in which the owner (in this case, the state of Washington) solicits bids from pre-qualified contractors and awards the project to the lowest responsible bidder. The Design-Build agreement is an alternative approach in which the owner contracts with a single firm to provide both design and construction services.