This study compared the effectiveness of teaching multidigit addition of whole numbers without regrouping prior to teaching it with regrouping to teaching multidigit addition with and without regrouping simultaneously. Pretest/posttest-delayed posttest results of second grade students (n=151) from seven randomly assigned classrooms indicated no…

Future research initiatives on learning and instruction are considered to be of most worth if grounded in general systems theory and if multiple research methods are used. Discussed are an information processing theory and a theory for the structure and structuring of stored information. (MNS)