This learning object is divided into five sections. You can work through the sections sequentially or choose your own path based on interest and expertise.


To navigate this learning object, use the links at the bottom of the page. Unless you have chosen to override the site’s style-sheet, links you have visited will be blue and links you have not visited links will be yellow. The green triangle indicates the section you are in while the light blue bar highlights the page you are on.

At the top of the page you will see three buttons:

Links Within the Text

Throughout the text you will see some red, underlined words. Move your mouse over these words for a short, pop-up definition; click the word to go to its entry in the glossary.

Interactive components will appear in a new window. Once you have completed the interactive section and are ready to return to the main part of the learning object, use the Close button at the bottom of the new window.