These flow charts depict the procudures followed when using the NEC3 Supply Contract (SC). They are intended to help people using the SC to see how the various SC core clauses and Options come together to produce clear and precise sequences of action for the people involved. 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.