Highlight scope
The system boundary against the Plan of Work
Modules across the top, reporting scopes beneath them, and the RIBA stages aligned underneath — each stage sitting under the modules whose activities it describes. Click any module for its definition.
When each module firms up
The other relationship, and the one that makes the gap awkward. Above, a stage describes a module's activity. Here, a stage is a point at which you have to answer for every module — C and D included, long before any stage describes them. Shading is how firm that answer can be.
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Pick a module from the boundary diagram or the matrix. You'll get the RICS definition, what sits inside it, and how the data behind it typically changes as a project moves through the Plan of Work.