Historical Investigation

http://americanhistory.si.edu/kids/springer/

Systems Thinking

http://www.learner.org/interactives/parkphysics/coaster/section1.html

Invention

http://www.inventionatplay.org/playhouse_main.html

Decision Making

http://www.econedlink.org/lessons/index.cfm?lesson=EM181&page=teacher

Templates

http://edweb.tusd.k12.az.us/templates/hypotheses.htm

Questioning

http://www.pbl-online.org/driving_question/drivingquestion.html