There have been numerous attempts to. define a design process. A possible way of approaching any problem is to break it down into 4 distinct areas of ANALYSIS, RESEARCH, EVALUATION and SOLUTION.
Analysis What is the problem / brief/ question about? What do I need to know more about? What already exists? What are the specifications, materials, functions, client preferences that are a fixed part of the brief? (Do not attempt to invent solutions at this stage, just background information and parameters.)
Research How many ideas occur in response to your analysis? Ask yourself "What happens if ......?" Use lateral thinking & word association to spur originality Find the extremes (simplest to over-the-top / bizarre) Use mechanicaltrial and error eg. mock-ups to find how & where to ioin bits together. Try out likely materials & find their limitations Go for lots of fast possibilities rather than one precious solution. Be prepared to go back to "Analysis".
Evaluation Which fulfils the brief? Which looks the best? ... but which does the client prefer? ,How does it fit the current ethos/design trends/ match the competition? U p-market, down-market? ls it easy, cheap, expensive, impossible to make? Does it work? Be prepared to go back to "Analysis" / "Research".
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compromise between what you want to do, what can be afforded, and what is feasible. Be sure this is acceptable by getting feedback on all the possibilities before you reach this stage. Be prepared to go back to "Analysis" / "Research".
The RIBA handbook describes the design process as: Phase 1 assimilation. The accumulation and ordering of general information and information specifically related to the problem in hand. Phase 2 general study. The investigation of the nature of the problem. The investigation of possible solutions or means of solution. Phase 3 development. The development and refinement of one or more of the tentative solutions isolated during phase 2. Phase 4 communication. The communication of one or more solutions to people either inside or outside the design team.