Free-Floating Rationales

A free-floating rationale is a functional reason that need not be represented by the organism whose feature or behavior it helps explain. Dennett uses the concept to distinguish evolutionary design from conscious planning.

A feature can have an explanatory function without its organism representing the reason for that function. The benefit can help explain why a trait was retained while no conscious planner ever formulated the rationale. This separates a reason available to an investigator from a reason entertained by the acting creature.

Finding a useful effect is not enough to establish an evolutionary function. Traits can be byproducts, constraints, historical inheritances, or useful in a new way. In organizations and culture, ask how a practice spread or persisted rather than assuming every surviving arrangement efficiently serves the whole system.

When to use it

Use when apparently purposeful behavior is being taken as proof of conscious understanding or when investigating an unplanned practice's possible function.

How it can help

Separate functional explanation, historical retention, and intention. Investigate evidence for the proposed rationale and compare alternative explanations.