Eksperiment
by Kerstin Kuum
1. Control
1.1. Subjects
1.2. Attitude
1.3. Conditions
2. Natural experiment
2.1. Accuracy
2.2. Observations
2.3. Isolation
2.4. Reaction/explanation
2.5. Before and after the event
3. Probability
4. Manipulation of different variables instead of the subjects themselves