What does NEC4 clause 60.1(16) mean?

Clause 60.1(16) is a narrow event about testing. The event is that the Client does not provide materials, facilities and samples for tests and inspections as stated in the Scope. The contract's testing section requires the Contractor and the Client each to provide the materials, facilities and samples for tests and inspections that the Scope allocates to them, and this paragraph gives the Contractor a remedy when the Client's side is not provided. It overlaps with clause 60.1(3), but it does not depend on a date shown on the Accepted Programme; it depends on what the Scope states, so a Contractor whose programme does not show the Client's test facilities may still succeed here. To rely on the paragraph the Contractor shows the Scope provision that puts the item on the Client, the test or inspection it was for, the point at which the item was needed for that test, and that it was not provided then. The Contractor notifies the event under clause 61.3 within eight weeks of becoming aware, which is when the test could not proceed for want of the Client's item. The change to the Prices is assessed under clause 63.1 as the effect on actual Defined Cost by the date of the notification and forecast Defined Cost afterwards, plus the Fee, most often the cost of sourcing the item elsewhere with the Project Manager's agreement, a repeat test visit, and resources standing while the test was rearranged. What most often goes wrong is that the Scope is silent or ambiguous about who provides the item, in which case the paragraph gives nothing and the argument moves to whether the Scope was changed, or that the Contractor sources the item itself without telling anyone and presents the invoice at the next assessment without a notification. Any delay to the Completion Date is assessed separately under clause 63 by the programming expert.