9. "History shows that men's actions are governed by some kind of calculable law." The problem is to discover these laws.
XXI. Some Positive Guides and Suggestions.
1. Clearly set forth the problem to be investigated.
2. Discover the facts that bear upon this problem—but only the significant facts.
3. Relate the facts to each other.
4. Formulate a mental picture of the events or scenes.
5. Seek to discover the causes that lie back of the facts—the geographical, meteorological, geological, biological, physiographic, and human.
6. Seek to discover the motives, interests, and intentions of men and societies in producing the events.
7. Seek to discover the means employed to realize or attain the ideal, motive, or purpose.