 More clearly worked out than Brentano’s early, general notion of intentionality are his views about what he took to be its most basic forms (alluded to in the quote above). Brentano’s philosophical project of giving a typology of intentional states, their constituents and interdependencies—what he called “descriptive psychology”—was ambitiously aimed at providing a framework for experimental inquiries into causal psychological laws, as well as for logic (including theory of knowledge), aesthetics, and ethics.