A surgical system for performing a surgical procedure, the surgical system comprising: an intelligent surgical device including: a housing (12,14); a power source supported in the housing (12,14); at least one drive motor supported in the housing (12, 14) and being in electrical communication with the power source; and control circuitry interfacing with the power source and the at least one drive motor, wherein the control circuitry includes a feedback system for monitoring at least one condition of the surgical device during a use thereof and for changing an operative parameter of the surgical device when a change in the at least one monitored condition occurs; and characterized in that said surgical system further comprises a plurality of non-intelligent loading units, each said loading unit having a different unique length of firing stroke, each said loading unit not including an identification member, each said loading unit being configured for selective connection to the housing (12,14) of the surgical device and being actuatable by the at least one drive motor, each said loading unit having at least a first condition and a second condition, wherein the second condition of each loading unit is the end of the firing stroke thereof, wherein, during operation of the surgical device having one of said loading units connected thereto, the at least one drive motor actuates the loading unit from the first condition to at least the second condition; and wherein, when the loading unit achieves the second condition, a change in the at least one monitored condition, relating to a particular parameter of said loading unit, occurs and an operative parameter of the surgical device is changed. an intelligent surgical device including: a housing (12,14); a power source supported in the housing (12,14); at least one drive motor supported in the housing (12, 14) and being in electrical communication with the power source; and control circuitry interfacing with the power source and the at least one drive motor, wherein the control circuitry includes a feedback system for monitoring at least one condition of the surgical device during a use thereof and for changing an operative parameter of the surgical device when a change in the at least one monitored condition occurs; and a housing (12,14); a power source supported in the housing (12,14); at least one drive motor supported in the housing (12, 14) and being in electrical communication with the power source; and control circuitry interfacing with the power source and the at least one drive motor, wherein the control circuitry includes a feedback system for monitoring at least one condition of the surgical device during a use thereof and for changing an operative parameter of the surgical device when a change in the at least one monitored condition occurs; and characterized in that said surgical system further comprises a plurality of non-intelligent loading units, each said loading unit having a different unique length of firing stroke, each said loading unit not including an identification member, each said loading unit being configured for selective connection to the housing (12,14) of the surgical device and being actuatable by the at least one drive motor, each said loading unit having at least a first condition and a second condition, wherein the second condition of each loading unit is the end of the firing stroke thereof, wherein, during operation of the surgical device having one of said loading units connected thereto, the at least one drive motor actuates the loading unit from the first condition to at least the second condition; and wherein, when the loading unit achieves the second condition, a change in the at least one monitored condition, relating to a particular parameter of said loading unit, occurs and an operative parameter of the surgical device is changed.