The form and function of a collaborative assessment known as a "Buddy Quiz"
is presented. The assessment is conducted in three successive phases over a
contiguous 45- to 60-minute class period. A portion of each Quiz is completed
in collaboration with one or two peers and a portion is completed without
collaboration. The Quiz is primarily summative and is also designed to include
formative aspects. The representation in the Quiz of the scientific enterprise
as collaborative and individualistic is discussed. The employment of this
instrument in a ninth-grade (age 15 years) conceptual physics course in an
independent US secondary school is described and student feedback is presented.Comment: accepted to Physics Education; 11 pages, 1 table, 2 figure