The purpose of this text is to present methods for computing 'ball-park' numbers of tability and control derivatives for conventional, tail-aft airplanes in subsonic flight. Such methods are particularly valuable when doing parametric or preliminary design studies of stability and control characteristics of airplanes. For class-room purposes and design project exercises, experience at The University of Kansas has shown that the methods resented in this text allow students to come up with estimated stability characteristics of their own design within a reasonable period of time and with reasonable accuracy.