Hey bud, Ive never studied the Robin chair, however a chair i am familiar with is the Panton Chair by Verner Panton his design is absoloutley flawess again, is reflected of a iconic design due to the shape, colour and material used at the time. He orginailly used fiberglass but due to breaking under tension, he had to use polyproplene instead. This would be a great example to talk about the possibly development in material, manufacturing methods, colours etc. You could also mention the B32 chair by Bauhaus. It is great chair to study in term of applying bauhaus principles such as, Form follows function, everyday object for everyday people, geometrically pure and a machine age.
In terms of notes, i would research alot into your choosen product the more you know about it, the BETTER. the more specific detail you can give the more marks you can obtain in term of relating it back to the question. My D&T teacher said " always give a context" and " always think a food technology person is marking your paper, so make it really simple and context".
Hope that helps mate !