a standard defining QoS... help please

hi guys,
I've been told to come up with 4-5 important factors that would go towards producing a standard defining quality of service for a group discussion next week. Networking is a side element of my course (graphic design) that I have to do, so my knowledge is quite basic. Could someone please suggest some ideas for this discussion. I am thinking speed/allocation of bandwidth would definately have to be one of the factors but I'm drawing a blank on more! Any help would be appreciated

VTerm