If I ask where you are in your design project, you might say, “I’m doing development.”
But what are you developing? What remains unresolved? What will your next sketch or model help you decide?
Knowing the name of a phase is useful. Understanding its purpose helps you move forward.
The design process connects an identified need to a proposed solution through Needs Analysis, Idea Conceptualisation, Development and Prototyping. Research supports all four, while evaluation helps you judge what to keep, change or investigate further.
Needs Analysis: what is worth changing?
Investigate a person’s activity and the situation in which it happens. What are they trying to do? What gets in the way? What could become easier, safer or more appropriate?
Observe, ask questions and study existing arrangements. Check whether your explanation fits what actually happens. A proposed product such as “a phone holder” tells us little until you explain who needs it and why.
Your investigation should establish a worthwhile design opportunity. A design brief expresses the intended outcome; research helps you develop specifications that state what the solution needs to achieve. These can be revised as your understanding improves.
Idea Conceptualisation: what different approaches could work?
Explore possible ways of fulfilling that purpose. Sketch alternatives, borrow useful principles from existing products, combine features and use simple mock-ups to investigate promising thoughts.
For a hypothetical pen-storage project, a pocket, a clip and an elastic loop offer different ways of retaining the pen. Drawing the same clip in several colours gives you appearance options, but does little to explore alternative ways of holding it.
Compare your concepts with the user’s needs and the design specifications. Choose a promising direction for reasons you can explain.
Development: how will the chosen concept work in detail?
A promising concept still contains unanswered questions. Development is where you work through them.
How large should the opening be? Where will the user place their fingers? How do the parts meet? Which material and making method suit the intended use?
You still generate alternatives here. The difference is their purpose: you are resolving particular features of a chosen concept and bringing the decisions together into a workable whole.
Use sketches, measurements and models to check your assumptions. A change to one part may affect another, so keep checking the assembled design, its appearance and its use. Resolve enough detail to make the prototype with a clear intention.
Prototyping: what happens when the proposal becomes physical?
Make a working version that allows you to investigate the proposed solution in use.
Earlier models may have answered individual questions about size, access or movement. The prototype brings the developed decisions together so you can examine how they perform as a product.
Test it against the intended use and specifications. Record what happens, including limitations. Making something successfully does not, by itself, show that it meets the user’s need.
A test can reopen a design decision
In my clipboard pen-holder project, I began by sketching the pen’s cross-section and a holder around it. The sketch helped me think through the grip before printing.
The first print held the pen during light handling. However, a nudge on the unsupported section could dislodge it.
That finding sent me back to development. I doubled the gripping section’s length and added slots to the mounting plate.
The revision responded to something observed. Whether it provided sufficient retention still needed checking through use; a longer grip’s appearance alone could not establish that.
This is why research and evaluation belong throughout the process. Measuring the pen informs the design. Testing its retention provides more information. Evaluating that information tells you which decision needs attention next.
Your journal should record those connections as they happen: the question, the evidence, the decision and the resulting change.
Before moving on, be able to explain what you have found out, what you have decided, and what still needs resolving. Let that understanding guide your next action.
The phase names follow the official secondary D&T design model. This is an independent teaching resource, not an officially endorsed publication.
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