Organisations commission GIS work and receive maps. Maps are an output, not an outcome. The question that should drive a geospatial engagement is which recurring decision is currently being made badly for lack of spatial evidence.
Start from the decision
Prioritising maintenance, siting a facility, routing a network, assessing exposure — each of these implies a specific analysis and therefore a specific dataset. Working backwards from the decision usually reveals that far less data is required than a comprehensive survey would collect, and that some of it must be far more accurate than expected.
One authoritative source
The most common failure is not missing data but competing copies of it. When four departments each maintain their own version of the same asset layer, every analysis is contestable. Establishing a single schema with clear ownership resolves more problems than any amount of additional capture.
Design for the day after handover
A geospatial system decays without an update path. The deliverable is not the dataset; it is the dataset plus the schema, the procedures and the trained people who will keep it current.