This technical report describes a series of three studies designed to instruct students in the relationship between texts, comprehension questions, and two sources of answer information--the text to which a given question refers and their own background knowledge. The focus of the technical report is on individual differences in the amount and type of instruction most beneficial to students from fourth through eighth grade. The studies demonstrated that for the younger students, a longer (i.e., 6-8 week) instructional program was necessary, with gradually decreasing amounts of instructional time required as the students' age level increased. The studies also represent a continuum in instructional research that begins with a training study conducted in classrooms by a university researcher, and moves to instructional studies implemented by classroom teachers in their own classrooms. (Author/PN)