STEP 1 Consider Your Question or
(What am I testing and how can I do it?)
The most important thing is to design an experiment that
matches up with your question or problem. If you were testing human heart rate during
exercising, you wouldnt be dealing with different brands of tennis shoes! This is a
very hard step to the Scientific Method because there are so many things to look at or
consider. YOUR DESIGN SHOULD PRODUCE AN ANSWER TO YOUR QUESTION! You might
want to look back at your hypothesis for some help.
STEP 2 Think About All the
(What might change in my experiment?)
A variable is a difference or a part of your experiment that
can change. For example, if you were to do an experiment on plants, some of the things
that you could change include the amount of water or light, and the kind of dirt or plant.
You need to list all the things that can change in your experiment. Maybe you could let a
parent, teacher, or friend check over your list.
STEP 3 Set-Up a Controlled
(How do I keep the variables from
In your experiment design you can only have one variable
that changes. The variable that changes should be the one that you are testing. For
example, if you chose to do an experiment on light and plant growth, you would make sure
that the variable that changes is the amount of light. If you have more than one variable
that changes, that would make it an uncontrolled experiment. An uncontrolled experiment is
an experiment that will not give you the answer to your question OR give you the wrong
answer. Now use the list of variables that you made and make sure none of them change
except the one you are testing!
STEP 4 Doing the Experiment
(What materials do I need?)
This is the easiest part of designing and doing an
experiment because all you have to do is get your materials together and set it up!