The contract is signed, the Scope or Specification says the programme goes in as Primavera P6, and the tender programme was built in MS Project. An export produces a file, not a programme the client's planner will accept. This guide covers where NEC4, JCT and FIDIC put the software requirement and the first programme's deadline, what an import from MS Project keeps and loses, whether to convert or rebuild, and how to set the P6 programme up for the contract.