Historically, it was widely believed that diseases like cholera were spread by 'bad air' (the miasma theory). However, after John Snow mapped cholera cases to a water pump and Louis Pasteur published his work on micro-organisms, the scientific community underwent a major revolution, replacing the old framework with a new one based on germ theory.
With reference to this example, explain what is meant by a 'paradigm shift' in science.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.