Occasionally, a project may require specific expertise beyond what the Principal Investigator (PI) and co-investigators can provide. Consultants may be engaged as paid or unpaid collaborators. Whether paid or unpaid, individuals should be approached about consulting in the Plan/Propose stage. It is best practice to solicit a commitment by the potential Consultant to participate, should the project be approved. The commitment may take the form of a Letter of Commitment, and may be a formal written letter or an email message. If payment is considered, anticipated fees should be included in the commitment. Individuals with in certain fields are in high demand for their expertise. It is wise to identify “back-up” Consultants, should your first choice ultimately find they cannot participate in your project. Should the project move forward, a Consulting Agreement for each Consultant will be needed at the Setup stage.