To nested "OR" Abstract-search ERIC for instruments,
1) Enter your topic search terms (variables you wish to measure) in the first search box
2) In the next search box, enter the following search strategy: Survey* OR Questionnaire* OR Scale* OR Inventor* OR "Interview Schedule*"
3) In the adjacent drop down menu (to the strategy you just entered) scroll down and select (click to highlight) AB Abstract.
4) Click the Search button to initiate the search.