Iterative formative evaluations for Life on Earth have been conducted with adult and child museum visitors at the Harvard Museum of Natural History in the Romer Hall of Vertebrate Paleontology. Design study sessions were also conducted in the SDR Lab with Harvard undergraduates and in TIDAL lab at Northwestern University with groups of children recruited to participate in the formative evaluation. Between November 2010 – April 2012, over 340 participants were observed in these evaluations sessions. Participants were tested individually or in small groups. The small groups were comprised mostly of parents and children, siblings, and school classmates. The majority of participants tested were in our primary target age range of 9- to 14-years of age, and some small groups included children as young as 3-years of age and adults as old as 78-years of age.