A teacher's personally created metaphor of constructivist science teac
hing can be used as a reflective tool for initiating and sustaining ch
ange in the classroom. This study reports how one experienced general
science teacher used the metaphor tool during the implementation of co
nstructivist approaches in both biology and physics topics. Three gene
ral assertions are discussed. Although these were based primarily on t
he qualitative data, the quantitative data arising from the administra
tion of the Constructivist Learning Environment Survey were used to st
rengthen these data.