 After establishing the first principle and conceiving the act expressed therein, the philosophical task is then to discover what other acts must necessarily occur as conditions for the possibility of the original, “simply posited,” first act and then to do the same for each of these successively discovered acts (or the theorems in which they are formulated). By continuing in this manner, one will, according to Fichte, finally arrive at a complete deduction of the a priori structure of ordinary experience or, what amount to the same thing, a complete inventory of the “original acts of the mind.” This is precisely the task of the first or “foundational” portion of the Jena system.