The Control Theory Toolbox 1.0 is a collection of functions and programs to aid in solving control theory problems on the TI-89 and TI-92+ calculators. Bode and Nyquist plots can be generated, and there are functions to find poles and zeros, and calculate the vector margin. Gains and tranfer functions are expressed in the form they are commonly written on the blackboard, for example: 1/s and (s^2+s+1)/(s+3)(s+5). The Control Theory Toolbox is copyright (C) 2000 by P. Douglas Reeder ([e-mail]) and comes with ABSOLUTELY NO WARRANTY. It is distributed free under the GNU General Public Licence (see the text file gpl.txt). All programs and functions are stored in the CONTROL folder on your calculator, but are easily accessed whatever folder is current. A tutorial script is included in the group file; to run it, open it in the calculator's text editor and press [F4] repeatedly.