What does NEC4 clause 60.1(5) mean?

Clause 60.1(5) protects the Contractor against interference by people it does not control. The event has three alternative limbs: the Client or Others do not work within the times shown on the Accepted Programme; the Client or Others do not work within the conditions stated in the Scope; or the Client or Others carry out work on the Site that is not stated in the Scope. Others is a defined term for people and organisations who are not the Client, the Project Manager, the Supervisor, the Adjudicator, the Contractor or a supplier or subcontractor of the Contractor, so a statutory undertaker, a direct fit-out contractor or the Client's own operations staff all count. To establish the first limb the Contractor needs an Accepted Programme that shows the times within which the Client or Others were to work, which means the programme must plot their activities and not only the Contractor's; without that the limb fails. The second limb needs the Scope to state the conditions, such as working hours, sequence or areas, that the Client or Others were to observe. The third limb needs evidence of the work done and that the Scope did not mention it. The Contractor notifies the event under clause 61.3 within eight weeks of becoming aware of the interference. 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 disruption, return visits, protection and standing time. What most often goes wrong is that the programme shows the Client's activities as a note rather than as dated work, or that the Contractor records the interference in a site diary but does not notify it until the next application, by which time the eight weeks have passed. Any delay to the Completion Date is assessed separately under clause 63 by the programming expert.