Single-component

• The consultant provides a specific, single product (e.g., environmental document or wetland delineation survey).

• The scope of work is defined at WBS Level 7 or lower.

Multi-component

• An entire project is contracted out.

• The consultant provides specific, multiple products (e.g., environmental documents and PS&E).

• The scope of work is defined for the first component of work (WBS Level 7 or lower) but may not be well-defined for subsequent component(s) of work.

• The scope of the subsequent component(s) of work may be defined at WBS Level 7 or lower upon or near completion of the first component of work.

Task order-based

• A specific project has been identified.

• The detailed tasks are defined but are contingent on external factors that won’t be identified until future tasks are completed.

• Tasks cannot be detailed until the contract has been executed.

A contract to provide biological services at several sites on a project is one example of a contract that would use task orders to further define work.