This paper discusses the obstacles that the Philadelphia Zoo confronted when they attempted to evaluate and develop a series of interactive activity kits called "Explore-A-Zoo." The kits aimed to encourage families with children aged 3-9 to interact together in front of exhibits while at the same time improve their science process skills. This paper describes the challenges staff encountered while interviewing preliterate 3-5 year olds as well as highlights two data collection methods that they found successful.