SYSE.10:1 - Problem Frame

Engineering decisions often precede complete knowledge. Models make alternatives cheap to explore; experiments and trials expose selected parts of reality; operating observations arrive only after use. Each can be valuable without supporting the whole decision.

For example, a heat-transfer model can compare storage concepts while saying little about installation error. A controller bench can expose timing and interface faults while omitting occupants and seasonal operation. A field trial can support one configuration in one environment while leaving rare failures and another variant unresolved. A formal proof can establish a property of a formal object while leaving the implementation-to-model correspondence unsupported.

Projects fail in both directions. Scientific or mathematical prestige is promoted to a universal engineering law, so “the model says” or “research proves” dictates the design. Or useful partial knowledge is rejected because it cannot settle the whole outcome. The engineering move is to use the strongest claim supported by the current basis, state the stronger claim it does not support, and show what changes in the decision.