The scientific method is a systematic approach used in scientific studies to solve problems through observation, hypothesis testing, experimentation, and conclusion drawing. It involves making observations, formulating a hypothesis, conducting experiments to test the hypothesis, analyzing the results, and reaching a conclusion. The key steps are observation, problem statement, hypothesis statement, experimentation/data collection, and conclusion statement. Careful experimentation using variables, controls, and quantitative data helps scientists determine if a hypothesis is supported or needs revision. Established theories are explanations supported by many conclusions over time that can still be improved upon or replaced if disproven.