6. Finalize

The contractualization of the relationship will be based largely on the consultant's submitted and possibly renegotiated proposal. You will integrate it into the flow of your purchasing process, culminating in the issue of a purchase order.

Schematically, invoicing can be of two types (a priori already fixed at the proposal level) depending on the nature of the intervention:

• Type "régie or "obligation of means". Invoicing is based on the consultants' actual workload (multiplied by a daily rate), generally on a monthly basis.

• Fixed-price" or "obligation to achieve results" type. Invoicing is subject to triggering events (payment keys) that can be defined in a schedule (milestones, deliverables) or according to a specific partitioning (for example: 1/3 on order, 1/3 mid-term, 1/3 final...