- A good theory should be able to produce a testable hypothesis, which allows for falsification
Before the twentieth century Science largely used principles of the induction model- make an observation, hypothesise, test hypothesis, conclude , propose theory. Although rigorously empirical, the Deduction model, which places theory construction at the beginning has replaced it.
Karl Popper explains why. The deductive method involves starting with a theory and looking for instances that confirm it. The hypothetico-deductive model (Karl Popper) suggests theories should come first and be used to generate hypothesis, which can be falsified.
According to Popper falsifiability is key to the development of a theory. A theory can never be proved but can be disproved. If a researcher tries to disprove a theory and cannot then it is strengthened. If they can it should either be modified or replaced. This is how science progresses.
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