Three options for focusing your search include searching for your concept in the Title (TI Title) or in the Abstract (AB Abstract).
Once you discover a subject heading - either by inspecting your initial search results or by using the ERIC Thesaurus - you may also wish to limit by Subject (SU Subject).
After choosing your search terms and limiting to a particular field (Title, Abstract, Subject), you can move farther down the search page and limit by a particular Educational Level e.g. Elementary Education.
It is possible to select more than one option under Educational Level by keeping the Ctrl (Cmd) key depressed while clicking on multiple choices.