An EDD-- Experimental Design Diagram—is a graphic organizer that helps you focus on the important aspects of an experiment. It should include the following:

Hypothesis (preferably expressed as an “if-then” statement.)

IV (independent variable)

Levels of the IV—in what ways is the IV changed? Control—tell whether one is present

How many trials are you planning to have?

DV (dependent variable) & operational definition of the DV-how is the DV measured?

Constants (which variables are kept the same?)

How could the experiment be improved? (if your EDD is used to analyze an experiment)