S: Can you tell me exactly what a design specification is?
L: Yes, it's a kind of technical report where you describe how you design, and you construct, and possibly test, something that could be produced.
S: Oh, do you mean like a car engine?
L: Well, it could be a car engine, but it's more likely to be a smaller part of a car, for example a brake system, or if, in computer science it might be a piece of code that you have created and you've tested to show that you could use it in industry.
S: Oh, I see. So this is really only for the sciences.
L: Well, it's technical. It could be used in graphic design, for example, or occasionally it's used in other areas for website design, for example.
S: Oh, I see.