In this programmatic article, our aim is to sketch the outlines of a phenomenological constitution of quantum mechanics, thus drawing the ultimate consequence of previous phenomenological approaches to this theory. In other terms, we wish to show a way to ascend from the situated lived experience of a knowing and acting subject, to the structure and use of the quantum formalism. QBism (Quantum Bayesianism), with its motivated focus on lived experience, and its decision to take the elementary epistemic attitudes of agents as primitives of its axiomatics, will prove a decisive step to progress in this direction
