The box on the upper left-hand side of the Search Engine window initially displays the Criteria List for Content Theme. You can use the pull-down menu to access other Search Criteria Categories &emdash; grade level, curriculum project, subject, processes of science, and so on &emdash; and their associated criteria lists.

To select a Search Criteria Category, place the cursor on Content Theme, click and hold to get the other search criteria categories to appear. While holding down, move the cursor down the menu to the search criteria category you wish to select and release to display its list in the Criteria List box.