B.5.RC:4.5 - Establish the useful property and continue

Recover why the constructed object has the property the next use requires. An auxiliary construction can make the argument possible; an established property can permit the next construction step. Use B.5.RA when the argument is present but its reasoning remains unclear.

The useful stopping point can be:

• the required object and a sufficient account of the property being used;
• a conditional construction whose unresolved condition matters to the next decision;
• an identified missing input or operation, with enough context to obtain it.

Select the support needed for that next use under C.11.DUA and the relevant subject method. A design calculation, mathematical proof and trial assembly answer different questions. If an existing result already supplies the needed support, use it.

An explanation to a collaborator should let them continue from the recovered result or address the localized gap. Use the working drawing, expression or conversation when it already carries that information.