Final answer:
Engineers determine the success of their solution by whether it satisfies the established design criteria and constraints, such as functionality, safety, and sustainability. They evaluate each potential solution based on these factors using a documented and structured decision-making process.
Step-by-step explanation:
Engineers know they have designed a successful solution to a defined problem if their solution meets the design criteria and the constraints. This involves ensuring that the chosen solution, such as a solar still for desalination, meets all mandatory requirements and performs effectively within the limitations posed. During the evaluation of potential designs, each solution is assessed against the constraints and criteria, which may involve factors such as budget, schedule, usability, safety, and environmental impact. The selection process is structured and requires the requirements be met, selecting the best design based on these dimensions.
Furthermore, engineers consider the practicality and usefulness of their designs in everyday life, while always aiming to sustain natural resources and raise the standard of living. Their decisions must take into account internal, natural, man-made, and future systems, balancing a broad spectrum of factors to arrive at an optimal solution. The entire design process should be well-documented, justifying choices and highlighting the science connections that underpin the final solution.