Applicable ISO 9001:2015 clause

I don’t have enough information about what you consider a project. A project can be about design and development of a new product or service, and a project can be about product realization like a building.

If the project is about design and development monitoring delays can be used as a way of monitoring, of controlling, project evolution. In that case we are talking about clause 8.3.4 b) (project review activities) and 8.3.4 f) states the need of keeping records of project review activities)

If the project is about product realization clause 8.5.1 a) 2) can be related with results to be obtained with the project (quality, cost and delivery). Clause 9.1.1 (last paragraph) requires keeping records to evidence results.

The following materials will provide you more information about mandatory records:

- Article-  List of mandatory documents required by ISO 9001:2015 - https://advisera.com/9001academy/knowledgebase/list-of-mandatory-documents-required-by-iso-90012015/
- Free webinar on demand - Measurement, analysis, and improvement according to ISO 9001:2015 - https://advisera.com/9001academy/webinar/measurement-analysis-and-improvement-according-to-iso-9001-2015-free-webinar/
- Free online training ISO 9001:2015 Foundations Course – https://advisera.com/training/iso-9001-foundations-course/
- Book - Discover ISO 9001:2015 Through Practical Examples - https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/