Natural language is highly complex and can be challenging for some learners, yet the contribution of complexity to individual differences in language learning remains poorly understood. This poor understanding appears due to both a lack of consensus among researchers regarding what complexity is, and to on-line language research often employing…

Research on which aspects of the instructional process are most appropriately placed under learner control is reviewed. The review covers representative experiments from the 1960's in brief and experiments at the University of Texas from 1970 to 1973 in more detail. Although it appears that learner control can be helpful in mainline…

The major results and conclusions of a program of research concerned primarily with the relationship of cognitive abilities to learning are summarized. The major purpose of this research was to develop theorems of instruction related to the interaction of task variables and individual difference variables and to develop them in a manner relevant…