The Professional Services Contract is intended for use in the appointment of a supplier to provide professional services. It can be used for appointing project managers, supervisors, designers, consultants or other suppliers under NEC contracts and can also be used for appointing supliers on non-NEC construction projects or for non-constructionprojects. This document contains the core clauses, the relevant main option clauses, the secondary option clauses and the contract data. Construction Clients' Board endorsement of NEC3 The Construction Clients' Board (formerly Public Sector Clients' Forum) recommends that public sector organisations use the NEC3 contracts when procuring construction. Standardising use of this comprehensive suite of contracts should help to deliver efficiencies across the public sector and promote behaviours in line with the principles of Achieving Excellence in Construction.