I think only the first and last are really important. I've had very effective meetings where I was the only technical person and we didn't have a formal agenda.

I think only the first and last are really important. I've had very effective meetings where I was the only technical person and we didn't have a formal agenda. Often meetings with stakeholders where I wanted to know what I could do for them; what they needed. So I guess that's still an agenda, but more important is that I was in control and the meeting was small. Being a bystander in a big meeting, that is the worst. If it doesn't affect me and my input is not needed, why am I there?