One of the most intuitive forms of argument, Analogy is the common form of inductive inference, taking one causal relationship and relating it to another.  It is evaluated this way:

  1.  The number of entities observed in the analogy.
  2. The variety, or number of respects observed in the analogous entities.
  3. The similar attributes observed in the related entities.
  4. The similarity of observed causal connection in the entities.
  5. The dissimilarities observed in the comparison, by number, variety and importance.
  6. How strong an assertion of similarity may be made in the analogy.  (Intuitively: “This is EXACTLY like…”)