• Think about what types of things affect the topic you are working with. 
• Select one thing to change in your experiment that will help to answer your question.
• This thing that you change is your variable.
• The things that stay the same are called constants.
• Formulate a hypothesis-what do you think will happen if you change this one thing.
• Your hypothesis may be your question reworded into a form that can be tested by an experiment.
• Your hypothesis should be based on the knowledge you gained from your research.
• See the sample sentence frames below.
• Make an entry in your science journal explaining how you formulated your hypothesis.
• Show your hypothesis and your journal to your teacher.

Sample Hypothesis Sentence Frames

If _____, then _____.

Because _____, I think that _____ will _____.

Since _____, then _____.

I predict that _____ will cause _____  to _____ because _____.

My hypothesis is that _____ will _____ because _____.