The Maple software is a powerful system that you can use to solve complex mathematical problems. You can also create professional quality documents, presentations, and custom interactive computational tools in the Maple en- vironment. You can access the power of the Maple computational engine through a variety of interfaces. This manual describes how to use the Standard Worksheet interface. Some features are not available in the Classic Worksheet interface and Command- line version. The Standard Worksheet interface has two modes: Document mode and Worksheet mode. Using the Maple software, you can create powerful interactive documents. You can visualize and animate problems in two and three dimensions. You can solve complex problems with simple point-and-click interfaces or easy- to-modify interactive documents. You can also devise custom solutions using the Maple programming language. While you work, you can document your process, providing text descriptions. Using Document mode, you can quickly perform calculations. You can enter a mathematical expression, and then evaluate, manipulate, solve, or plot it with a few keystrokes or mouse clicks. This chapter provides an overview of Document mode. In Document mode, you can enter two types of content: Text and Math. The Text mode and Math mode icons at the left end of the toolbar indicate the current mode. The toolbar is located near the top of the Maple window, im- mediately below the menu bar. To evaluate a mathematical expression, place the cursor in the expression and press Ctrl + = (Command + =, for Macintosh). That is, press and hold the Ctrl (or Command) key, and then press the equal sign (=) key.