Excellent series of frequently asked questions re. Critical Design from Dunne & Raby:
'1. What is Critical Design?
Critical Design uses speculative design proposals to challenge narrow assumptions, preconceptions and givens about the role products play in everyday life. It is more of an attitude than anything else, a position rather than a method. There are many people doing this who have never heard of the term critical design and who have their own way of describing what they do. Naming it Critical Design is simply a useful way of making this activity more visible and subject to discussion and debate.'
One very interesting answer is the role humour plays:
'6. What role does humour play?
Humour is important but often misused. Satire is the goal. But often only parody and pastiche are achieved. These reduce the effectiveness in a number of ways. They are lazy and borrow existing formats, and they signal too clearly that it is ironic and so relieve some burden from the viewer. The viewer should experience a dilemma, is it serious or not? Real or not? For Critical design to be successful they need to make up their own mind.
Also, it would be very easy to preach, a skilful use of satire and irony can engage the audience in a more constructive away by appealing to its imagination as well as engaging the intellect. Good political comedians achieve this well. Deadpan and black humour work best. '
There are many more answers on their website...