The Development and Technical Assistance Committee: a) supervises UEFA's technical and football assistance/exchange programmes within its member associations; b) assists the flow of information regarding training, education and technical reports; c) supports UEFA's technical advisers and consultants; d) monitors the development and implementation of the UEFA Coaching Convention; e) oversees grassroots and player development, especially the Grassroots Charter; f) cooperates with the Alliance of European Football Coaches' Associations.
Look like from the piece above that they are about keeping the standards of their brand up. Thats through a number of different ways which are from Grass roots football to the top level.
Re: Behind the goal officials Stand near the goal behind the touchline. The Technical guys do technical stuff. It's pretty obvious when you think about it.