If there's one thing every junior consultant needs to have injected into their head with a heavy duty 2500 RPM DeWalt Drill, it's this: Customers Don't Know What They Want. Stop Expecting Customers to Know What They Want. It's just never going to happen. Get over it.
Instead, assume that you're going to have to build something anyway, and the customer is going to have to like it, but they're going to be a little bit surprised. YOU have to do the research. YOU have to figure out a design that solves the problem that the customer has in a pleasing way.
and he continues
Assume that your customers don't know what they want. Design it yourself, based on your understanding of the domain. If you need to spend some time learning about the domain or if you need a domain expert to help you, that's fine, but the design of the software is your job. If you do your domain homework and create a good UI, the customer will be pleased.
Now, I promised to tell you a secret about translating between the language of the customers (or nontechnical managers) of your software and the language of programmers.
You know how an iceberg is 90% underwater? Well, most software is like that too -- there's a pretty user interface that takes about 10% of the work, and then 90% of the programming work is under the covers. And if you take into account the fact that about half of your time is spent fixing bugs, the UI only takes 5% of the work. And if you limit yourself to the visual part of the UI, the pixels, what you would see in PowerPoint, now we're talking less than 1%.
That's not the secret. The secret is that People Who Aren't Programmers Do Not Understand This.
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