Theory basics
The University of California, Berkley defines a theory as "a broad, natural explanation for a wide range of phenomena. Theories are concise, coherent, systematic, predictive, and broadly applicable, often integrating and generalizing many hypotheses."
Any scientific theory must be based on a careful and rational examination of the facts. Facts and theories are two different things. In the scientific method, there is a clear distinction between facts, which can be observed and/or measured, and theories, which are scientists’ explanations and interpretations of the facts.
An important part of scientific theory includes statements that have observational consequences. A good theory, like Newton’s theory of gravity, has unity, which means it consists of a limited number of problem-solving strategies that can be applied to a wide range of scientific circumstances. Another feature of a good theory is that it formed from a number of hypotheses that can be tested independently.
The evolution of a scientific theory
A scientific theory is not the end result of the scientific method; theories can be proven or rejected, just like
hypotheses. Theories can be improved or modified as more information is gathered so that the accuracy of the prediction becomes greater over time.
Theories are foundations for furthering scientific knowledge and for putting the information gathered to practical use. Scientists use theories to develop inventions or find a cure for a disease.
Some believe that theories become laws, but theories and laws have separate and distinct roles in the scientific method. A law is a description of an observed
phenomenon that hold true every time it is tested. It doesn't explain why something is true; it just states that it is true. A theory, on the other hand, explains observations that are gathered during the scientific process. So, while law and theory are part of the scientific process, they are two very different aspects, according to the
National Science Teachers Association.
- source