See also. 1  Orthos (disambiguation) 2  Ortho Mode Transducer. 3  Orthochromatic. 4  Orthophotography. 5  Orthogonality. 6  Orthonormality. 7  Orthographic projection. 8  Orthoptera.
Doing a Fair Test. It is important for an experiment to be a fair test. You conduct a fair test by making sure that you change one factor at a time while keeping all other conditions the same. For example, let's imagine that we want to measure which is the fastest toy car to coast down a sloping ramp.ou conduct a fair test by making sure that you change one factor at a time while keeping all other conditions the same. For example, let's imagine that we want to measure which is the fastest toy car to coast down a sloping ramp.
1 If Your Teacher Assigned a Specific Area for your science fair project (like biology or earth science), then you should go to Science Fair Project Ideas. 2  Once you find a general topic that interests you, write down the question that you want to answer. If you can't measure the results of your experiment, you're not doing science! 2  You must be able to control other factors that might influence your experiment, so that you can do a fair test. 3  A fair test occurs when you change only one factor (variable) and keep all other conditions the same.