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| A phenomenon that has been verified by competent observers. Collection of facts generally precedes steps involving hypothesis testing. |
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| An educated guess; a reasonable explanation of an observation or experimental result (facts) that is not fully accepted as factual until tested over and over again by experiment. Usually the second step, after gather facts, of the scientific method. |
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| A way to determine facts and test a hypothesis. Experiments often look for results which would disprove a hypothesis. |
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| Experimental results can force a revision in the hypothesis to better account for new results. This leads to a new round of hypothesis testing. |
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| A general hypothesis or statement about the relationship of natural quantities that has been tested over and over again and has not been contradicted. Also known as a "principle." |
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| A synthesis of a large body of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world. |
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