I have been looking at this, which might be helpful to others:

http://mtstcil.org/skills/assert-5.html

And this

Your Communication Style
What do you know about your habitual communication style? Are you prone to aggressiveness, assertiveness, or passivity? Here are some questions you can ask yourself:

Do I seek out other people's opinions, or just share my own?
Am I upset if others don't agree with me?
Do I talk over people or interrupt frequently?
Do I check-in with people to see if they're comfortable, or do I force my own agenda?
Do I put people down?
Do I know how to stand up for myself?
Do I know how to disagree without being disagreeable?
Do I know how to get my needs met without violating the needs of others?