From Why design matters by Tristram Carfrae of Arup:
"Consider the three main ingredients of a typical project: quality, time and money. Without the inspiration that comes from design, they remain interdependent. So, for example, you can improve quality, but it will take longer and cost more. You can do things more cheaply but it will take longer and reduce the quality.
Design is what enables you to adjust these factors independently – ideally improving all three. So the genius of great design is that it allows you to improve quality while reducing programme time and cost. You can deliver a building that meets the client’s aspirations but also saves them money and is more sustainable than they thought possible.
The skill of the designer lies in sieving through the different opportunities to do this and using hunch and emotional response to find the most appropriate one. You can test the solution using analysis, but – as I’ve written about before on Thoughts – you can’t solve open-ended problems with mathematics alone. You need both sides of your brain; you need intuition as well as logic."