Paste each of these in your web browser one at a time.

http://wwww.businesseye.org.ok/OnlineGuides.html?page=3

there is a wonderful document there that covers a lot on assertiveness and different techniques. The other is

http://www.brefigroup.co.uk/training/decision_making.html

It has some useful resources on decision making.

http://www.businessballs.com/self-confidence-assertiveness.htm

http://www.humanmetrics.com/assertive/assertivenessguide.htm

http://www.sasked.gov.sk.ca/docs/health/health6-9/grade7.html

http://www.teachingsexualhealth.ca/media/lessons/7_DecisionMakingLess2.pdf

http://www.foundationcoalition.org/publications/brochures/effective_decision_making.pdf

These have some activities.