The scientific method is a body of techniques used to solve problems. When a scientist gains new information about a theory, the result is usually a new hypothesis.
The theory is modified.
A scientific theory
Scientist are always testing their models to get new information or results, but other times learning evidence makes scientist have to change their models so scientist can change their models in theory.
The new information or research will be either republished by the original scientist or sometimes a different group will take it and republish the scientific theory with the new information.
They use them to make new observations, that may result in the change of their theory.
Quantum theory was not the result of a single experiment, a single discovery, or even a single scientist. Quantum theory evolved gradually, over several decades.
Credit for developing cell theory is usually given to three scientists: Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow. In 1839. I found this answer on examville.com, helped me complete my homework assignment. Hope the information is useful.
ideas
The Atomic Theory
Cell Theory
cell theory
experiments test the scientist theory