Discrete Event Control Kit (DECK) is a toolbox (a set of functions) written in the programming language of MATLAB for the analysis and design of supervisory control systems based on discrete–event models. This software has been developed by Shahin Hashtrudi Zad and two of his graduate students, Shauheen Zahirazami and Farzam Boroomand. It has been developed and tested on MATLAB release R2012b. DECK is provided under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation. The text of the license appears in Appendix C.