 The “formal [or “general”] conditions of experience” include the forms of intuition (space and time), together with all the categories and principles of the understanding. The material conditions of experience include that which is given to us, through sensation, in perception. Kant is thus describing a three-stage procedure, in which we begin with the formal a priori conditions of the possibility of experience in general, perceive various actual events and processes by means of sensation, and then assemble these events and processes together—via necessary connections—by means of the general conditions of the possibility of experience with which we began.