Final answer:
The trigger for the structured systems analysis step of systems development is likely an approved feasibility document, as it indicates that the project is plausible and well-founded, transitioning from preliminary analysis to detailed systems analysis.
Step-by-step explanation:
The likely trigger for the structured systems analysis step of systems development is an approved feasibility document. This document is essential as it suggests that a preliminary analysis has been completed, indicating that the project may be both technically and financially feasible. The feasibility document comes after the problem definition step, where the scope and resources available are clarified. After the feasibility analysis, structured systems analysis becomes the logical next step to delve into system requirements and specifications.
During structured systems analysis, various potential designs and solutions are evaluated. This evaluation is against a set of established criteria and constraints to ensure that the design chosen aligns well with the needs. For example, if the best design identified is a solar still for desalination, then subsequent design steps, including detailed design and prototyping, will take place building upon that established direction. It is within this context that the approved feasibility document becomes crucial as it supports moving forward with the design process, transitioning from abstract concepts to practical, workable systems.