Scientists and engineers use data that they record/observe from tests to determine if their solution works.
Decide what data you are going to collect from your tests to prove your solution works and create a data table to record the results of your testing.
Test your design AT LEAST 3 TIMES!
Collect the data in an organized way. Write your step-by-step process for creating and testing your design.
Think about what you will measure when you test. How will you know if your design worked?
Make tables or charts to collect the data as you experiment.
Use units of measure as you collect the data.
A few tips for conducting your tests:
Keep your STEM project log handy. Design and set up the tables and graphs you expect to use prior to starting your experimentation. Include units where appropriate.
Keep a camera on location. The camera is a useful tool for documenting your project. Have another person take photos of you performing the experiment, and use the camera to record the progress and the results of experimentation.
Observe safety rules. Cover safety issues with your science exhibition advisor/teacher. Do not use any equipment that is unfamiliar to you; learn to use it before beginning the tests.
Make entries in your STEM project log as you go. Record data, both quantitative and qualitative, in your logbook. Sometimes what appears to be irrelevant or a failure on one day may become important information at a later date.
Enter measurements in your tables. As you proceed with your project, make certain you include the units for any numbers you record.