Experimental phenomenology is the science of subjective experience conducted with scientific methods. Conceptually framed in empirical and descriptive psychology, it makes it possible to develop a science of consciousness per se, based on proper observables, methodologies, and measurement, to determine the nature and the relationships of dependence among phenomena. In experimental phenomenology, the description, manipulation, and demonstration of subjective experiences are performed at the level of appearances only. The study presents the assumptions, the object, and the methods of the approach. It does so in contrast with contemporary theories of consciousness by emphasizing its differences with respect to both psychophysics and introspectionism, with which it is often confused.