1. Propose more than one solution to a problem

2. by elimination (scientific method) choose best one (one that fits most of the data)

3. simplicity--least complex emplanation

1. Induction-reasoning from particular facts to general conclusions (hypothesis)

2. Deduction-using existing Laws, theories, logic and original hypothesis Predict observations

3. Theory-predictions verified, high degree of validity

4. Scientific Laws "principle of truth"

5. Paradigm-prevailing principle help define the entire structure of particular subject