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Separate urgent exposure from convenience
List actual failures, unsupported devices and changes in occupancy. A damaged door or missing recording may deserve an earlier phase than a feature request, but the owner should set the priorities.
Design the destination once
Choose identifiers, network assumptions, head-end capacity and migration paths for the whole facility. Subsequent phases can then add devices without undoing earlier cable and power work.
Give each phase its own handoff
State which systems stay active, which work is deferred and what evidence will close the phase. Retain an updated issue list and a budget decision for the next step.
Working example: The scenario below is illustrative. It describes a practical design and review method, not a completed customer project or a guaranteed result.
A working scenario
An occupied campus cannot shut every doorway and recorder down for a single weekend. Divide work by operational dependency, not only by building floor.
The decision to make before buying
Map temporary access, cabling pathways, IT changes, migration of user data, protected recordings and staff training at each boundary. Price necessary overlap explicitly.
A useful acceptance test
Before starting the next phase, verify the current one passes agreed scenarios and that remaining work has a safe temporary state. Rehearse a rollback for critical cutovers.
What the owner should receive
Keep a phase map, outage calendar, responsibilities, acceptance gates, open risks and communication plan for occupants.
Questions owners ask
Where do phases usually fail?
At the boundary: old and new credentials coexist, recordings split across platforms, the temporary door state is unclear or staff are trained on the final system before they must use an interim one. Define each phase's steady state, allowed outage and support owner. Price overlap rather than assuming it appears for free.
How should a phase be accepted?
Verify that the completed portion works for its intended users and that unfinished portions remain safe and supportable. Record missing devices, temporary measures and owner-approved exceptions. Release the next phase when dependencies are genuinely ready, not simply because the calendar says so.