This manual describes the preliminary release of the DELVE environment. Some features described here have not yet implemented, as noted. Support for regression tasks is presently somewhat more developed than that for classiication tasks. We recommend that you exercise caution when using this version of DELVE for real work, as it is possible that bugs remain in the software. We hope that you will send us reports of any problems you encounter, as well as any other comments you may have on the software or manual, at the e-mail address below. Please mention the version number of the manual and/or the software with any comments you send. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for non-commercial purposes only is hereby granted without fee, provided that the above copyright notice appears in all copies and that both the copyright notice and this permission notice appear in supporting documentation, and that the name of The University of Toronto not be used in advertising or publicity pertaining to distribution of the software without speciic, written prior permission. The University of Toronto makes no representations about the suitability of this software for any purpose. It is provided \as is" without express or implied warranty. The University of Toronto disclaims all warranties with regard to this software, including all implied warranties of merchantability and tness. In no event shall the University of Toronto be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or proots, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this software. If you publish results obtained using DELVE, please cite this manual, and mention the version number of the software that you used.