Why after-sales service needs so much information
A project with forty dwellings produces dozens of questions and remarks after the handover. They come in by phone, by e-mail or in a conversation on site, to the project manager, the salesperson or the contractor. Whoever later wants to know what happened to a remark first has to go and ask.
To handle a report, you need information from all the previous phases: which kitchen the buyer chose, which fitter did the bathroom, which appliance is installed and how it works. If that information is scattered, every report starts with searching.
With IRP in Lean ERP that information stays with the dwelling, from the subdivision to the handover. After-sales service is the last phase of the step plan, on the same plot. You can model your own processes in IRP.