The present paper examines a collaborative study that two teacher educators conducted across two sites. The researchers designed the wiki to support teacher candidates’ critical thinking about learner characteristics; community, classroom, and school factors; and pedagogical content necessary to support elementary school students’ literacy development. Results show that peer collaboration on wiki exchanges supported collaboration and critical thinking about student characteristics and instructional pedagogy. The wiki posts indicated that the wiki supported candidates in considering the developmental needs of students; students’ diverse approaches to learning; and students’ existing skills, abilities, and prior knowledge. The wiki also supported candidates in considering their pedagogical practices in relation to their students’ levels of literacy development.