Chapter 5 recap
Safety and project controls
The key takeaways from this chapter’s 4 lessons.
Safe sequencing with 4D
- Look at each week of the 4D model for people, not just elements: who works where, and what is above them.
- Stacked trades, lifts over occupied areas and open edges show up clearly when you play the programme.
- Each problem found becomes a change to the sequence, a temporary work, or an exclusion zone in the logistics model.
- Review the 4D model with the site manager and the safety advisor before each look-ahead.
Health and safety information at handover
- The health and safety file holds what future workers need to know: residual risks, hazardous materials, how to access and remove things safely.
- Information linked to elements and assets is found when someone works on them; a separate PDF usually isn't.
- Keep it short and specific: the risk, where it is, and what to do.
- Agree early who provides each part and check it at every milestone, like any other asset information.
Progress against the plan
- Progress measured on elements (built or not, by zone) is more objective than a percentage someone estimates.
- Planned value, earned value and actual cost compare what should be done, what is done, and what it cost.
- The 4D model shows the planned state on any date; actual dates show where the job really is.
- Report by zone and package, with the two or three numbers that lead to decisions.
Reporting the cost of change
- Every change report compares two revisions element by element, against a saved baseline.
- Price the change from the same rates as the estimate, so the numbers reconcile.
- Some changes don't show in quantities (a bigger window counted as one window); check what each quantity measures.
- Report the change with its cause, its cost and what's not included, before it's approved.