Why use models for investing?

Why we use models to help with the investment process:

• Provides structure for discussion; We don't say …  "we feel the market is oversold".
• Provides discipline; creates sameness with decisions.
• Encodes history of markets through numbers.
• Focuses discussion on where there are disagreements. Models serve as a null hypothesis.
• Generates focus on where we are in the market cycle. 
• Allows for "probability speak". We can talk about odds.