The current study examined the development of two effects that have been found in single-digit multiplication errors: relatedness and distance. Typically achieving (TA) second, fourth, and sixth graders and adults, and sixth and eighth graders with a mathematics learning disability (MLD) performed a verification task. Relatedness was defined by a…

Diagnostic/prescriptive mathematics was examined to ask whether a sufficient body of professional knowledge and practices exist to warrant its inclusion in teacher preparation. Argues that diagnostic/prescriptive mathematics does constitute an appropriate topic for consideration as content in revised teacher preparation programs. (PK)