[Gareth321]

You need to think outside the box a little. They're not going to need to write a requirements doc from scratch. They'll tell it to copy a piece of software which is already established and make some customisations or improvements based on their needs. This is a few sentences.

[qsera]

But if most software is created by user, then where does this reference piece come from?

[Gareth321]

The same place all creative reference comes from: someone or something else. We have a nearly unlimited well of creative and technical reference now.