I use this notetaking sheet to support students as I teach them about the design of controlled experiments. The material is further supported by the powerpoint for this unit, which you can buy at TpT and also see at my website at http://www.sciencemusicvideos.com/curriculum/scientific-method-unit-with-handouts/
Please look at the .pdf preview (which is a teacher's version of this document) before purchasing this document. You can download a blank pdf at the my website (same link as just listed above). Only buy the Word version if you want to customize this.