The best bids are written by people who have adequate technical knowledge, combined with the time and motivation to commit to the document. The knowledge can either be within their own expertise, or solicited from others. When deciding how to structure a bid team remember to think about all three factors. Winning bids can be produced equally well by sales people, by subject matter experts or by administrators.
There is no ‘correct’ structure for a bid team, nor is there a ‘right’ place for bid people to sit within an organisational structure.