Rebecca,
I would suggest that if you are looking for in-depth data, such as critical thinking growth, you identify a particular school or schools that historically brings students to your museum and not focus on everyone that attends. My museum has several programs that allow students to tour at reduced rates. All teachers receive a general questionnaire on Survey Monkey after they come for a tour. This provides us feedback on: scheduling, reception, tour content, docent quality, pre-tour packet, etc.
For the program that I manage, we do a more in-depth data collection from students. This data is used to support funding for the program. We assess PK, grade 1, and grade 5 at 4 of the 9 schools in the program. Because these students come on field trips every school year, focusing on assessing those particular grade levels helps us get a baseline and compare the growth over both one year and multiple years. This assessment includes: an interest inventory to show how they feel about looking/talking about art, making art, visiting a museum and gardens; questions regarding key vocabulary; and we also show an image from our collection and have the student go through a written version of The Feldman Approach to Viewing Art (that is the method we use on our tours).
We work with an outside evaluator to develop the assessment tool. Museum staff administer the assessment both at the beginning of the year and the end of the year to the same group of students. This data is then coded and sent onto the evaluator who looks for trends and writes a report for our funders. Because we have been working with these schools for many years, we can track students from PK to 5th grade if they are still attending that school.
So, you can see starting with one or two schools that you have a history with is helpful. It is time consuming to administer the assessment (4-5 minutes per PK or 1st grader- 5th can be done whole group in about 15 minutes), but if staff does it, rather than classroom teachers, it will be a little more objective. Ideally, you would have a third party conduct the assessment, but that is often not feasible.
If you have any questions about what we do here, please email me: dhause@cummermuseum.org
Hope that was helpful!
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Dulcie Hause
Museum Educator
The Cummer Museum of Art & Gardens
Jacksonville FL