SYSE.6:1 - Problem Frame

Engineering architecture decisions coordinate many later choices without deciding every detail. They can fix a functional allocation, module boundary, interface grammar, placement, control boundary, redundancy principle, product-family variation policy, evidence boundary, or other selected structure that several realization and specialist decisions must respect.

The decision sits between possible futures and physical realization. Its grounds may include, for example, current descriptions, comparisons, estimates, experiments, or specialist returns. Later Work may produce a different actual structure or expose consequences that were not visible. The architecture decision must close enough choice for current engineering Work while preserving alternatives and explicit conditions for revision.