How does NEC4 clause 15 work?

Clause 15 deals with problems before they become compensation events, and it puts a price on ignoring them. In the NEC4 main contract it binds the Contractor and the Project Manager. On an NEC subcontract it binds you and your main contractor. Under clause 15.1, each gives an early warning as soon as it becomes aware of any matter that could raise the total of the Prices. The same goes for anything that could delay Completion or a Key Date, or impair the works in use. Under clause 15.2, the Project Manager keeps the Early Warning Register, enters each matter on it, and calls the first early warning meeting. Under clause 15.3, those at the meeting work together on ways to avoid or reduce the effect. They look for solutions that help everyone affected, decide the actions and who takes them, and decide which matters can come off the register. Under clause 15.4, the register is revised and issued after each meeting. An early warning is not a compensation event notification and does not replace one. They are separate, with separate consequences. The cost of not warning sits in clauses 61.5 and 63. If it is decided you did not give a warning an experienced contractor could have given, the event is assessed as if you had. Cost a timely warning would have avoided is left out. Under Options C to F, cost incurred only because the warning was not given is also Disallowed Cost, cost the contract will not pay. Four things go wrong. Early warnings are seen as admissions or claims, so nobody gives them. People assume the compensation event notification does the same job. The register is never revised, so decisions are lost. And the clause 61.5 decision arrives with no record of what the warning would have changed.