A Prototype Works Once. What Decision Can the Buyer Make from That?

Record the conditions and limits behind each custom vending prototype observation.

2026-10-16

A prototype observation is evidence about a particular configuration under particular conditions. It is not automatically evidence that a custom vending machine is ready for production. A useful review log connects what was observed to the decision it supports.

Record the build first

Identify the prototype, relevant hardware configuration, software version and test goods. Note temporary parts or manual interventions. If a technician adjusted the arrangement between trials, record the change rather than presenting all trials as one unchanged setup.

Distinguish three outcomes

An observation describes what happened. An issue explains a difference from an agreed requirement. A decision states whether the evidence is sufficient to move forward, whether more work is needed or whether the requirement should change. Keeping these separate prevents enthusiasm about a demonstration from closing an unresolved issue.

A successful cycle should have its conditions attached. An unsuccessful cycle needs enough detail for investigation. Agree the necessary test scope with the supplier instead of inventing a universal number of cycles.

Carry the limits forward

Assign every open issue an owner and a next action. When a limitation is accepted, include it in the approved operating scope and handover information. Before production release, confirm that the proposed production configuration actually matches the configuration the decision covered.