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I Introduction The BehavePlus fire modeling system is a computer program that is based on mathemati- cal models that describe wildland fire and the fire environment. It is a flexible system that produces tables, graphs, and simple diagrams. It can be used for any fire management application that involves modeling fire behavior and effects, including projecting the behavior of an ongoing fire, planning prescribed fire, assessing fuel hazard, and training (Andrews 2007). Successful application of the system is dependent upon decisions made by the user. Those educated in fire behavior understand the fire modeling foundation with the associated assumptions and limitations as well as the influence of various input variables on calculated values. An effective fire modeler has a basis of fire and fuel ex- perience to use in recognizing whether values are reasonable and in making appropriate adjustments. BehavePlus is designed to balance ease of use with options and features that users want and need. A user who is satisfied with the "default" selections can quickly run the pro- gram to get results. If the user has other needs, the program can probably meet them. If the user is not satisfied with the form of a table or graph produced directly by Behave - Plus, results can be exported and reformatted using other software. BehavePIus offers many features and options to enhance its application. Units and deci- mal display and the form of the output tables and plots can be changed. The header on the worksheet can be expanded to include lines for prescribed fire planning. Wind speed can be entered for midflame height or for 20 -ft or 10-m height with a wind adjustment factor that is either specified or calculated. A user who is aware of the features offered in the program can make the most effective use of BehavePlus. A summary list of tips and tricks with reference to the relevant section of this paper is provided in Appendix A, and Appendices D through H provide reference tables previously available only in the Help system: Input Options, Output Variables, Menu Items and Options, Units and Decimals, and Appearance Preferences. This document supplements other published materia] that describes BehavePlus. The User's Guide (Andrews and others 2008) addresses operation of the program in the form of a reference guide. Because additions in Version 5.0 did not change basic operation of the program, the Version 4.0 User's Guide was not updated and remains valid for Version 5.0. (See the version comparison PDF on the BehavePlus web site.) The Variables paper (Andrews 2009), which was updated for Version 5.0, is a reference guide that describes the more than 180 input and output variables in BehavePlus. The document is most use- ful when viewed on a computer, utilizing the numerous links and bookmarks. Both the User's Guide and the Variables paper are bundled with the BehavePlus program as part of the Help system. This publication is not a reference guide like the User's Guide and Variables paper, which are designed to help you find information on a specific topic. Nor is it a step-by-step de- scription of operation as presented in the lessons (Appendix B) or a manual that teaches you how to do fire modeling. This publication's focus is on program operation, design, and features. Even experienced users might not be aware of all of the features described in this paper. We explain the program's design to help the user understand why the pro- gram behaves the way it does. In some cases, we state that something can be done but USDA Forest Service Gen. Tech. Rep. RMRS-GTR-249. 2010