Step Four. Select Subject from the Criteria List (you should see Subject appearing in the Criteria List.) Highlight Ecology/Environment in the list and Add it to the Selected Criteria Box.

You now should have found resources that fit the following criteria: Tradeoffs and Problem Solving (in general) or Problem Solving&emdash;Applying, and Ecology/Environment.

Note: You can use the Undo command in the Edit menu to cancel your most recent action while in the Search Engine window. For example, in the step above, your last action was to add Ecology/Environment to the Selected Criteria Box. Using the Undo command would remove that criterion from the box.