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Popular belief holds that much of what is taught in classrooms is forgotten shortly thereafter. However, there is evidence from numerous studies that long-term retention for knowledge taught in school is substantial. These studies are reviewed, and several variables that affect the ability to remember are discussed. The article concludes that (a) students retain much of the knowledge taught in the classroom; (b) retention decreases over time as a function of the length of the retention interval but the forgetting curves for knowledge taught in school do not decline as rapidly or asymptote as low as the curves observed in traditional laboratory studies; (c) increasing the level of original learning differentially affects retention performance; (d) both instructional content and assessment tasks affect learning and retention, with one of the most consistent effects being that recognition tasks are retained at higher levels than recall tasks; (e) most instructional strategies that promote higher levels of original learning do not result in differentially better retention (however, several exceptions are discussed); and (f) while higher ability students learn and remember more than lower ability students, there is no evidence for differential forgetting. Implications for research and teaching are discussed.

This investigation focuses on the relations between prior beliefs, methodological concepts, and college students' (N ¼ 211) scientific reasoning in different problem contexts. Participants were presented with exercises that described the method and results of experiments, and were asked to draw conclusions about the causal status of variables that violated their prior beliefs. Participants drew conclusions in both abstract (i.e. recommend a conclusion for the fictional experimenter), and personal settings (i.e. draw their own conclusions about the phenomenon). Participants' recommendations for the hypothetical experimenter were predicted by their understanding of two methodological concepts: the function of empirical evidence and experimental control. Students' personal conclusions were predicted by their prior beliefs and their appreciation of the objectivity of inquiry. Thus, even when students understand in the abstract how data should relate to scientific conclusions, prior beliefs often take precedence in their own conclusions, especially when they do not understand the issue of objectivity.

Three experiments examined students' long-term retention of knowledge learned in college courses. In Experiment 1 retention was measured 4 and 11 months after the term ended. Students retained a great deal of what they originally learned, and there were no differential forgetting effects as a function of level of original learning. Experiment 2 compared retention for recall test items and 3 types of multiple-choice test items: recognition, comprehension, and mental skills. Students performed poorer on recall items, but there were no differences among the multiple-choice items measuring the other types of tasks. Experiment 3 analyzed retention for student tutors. Tutors retained more after 4 months than the students they tutored. This suggests that tutoring, a type of overlearning, has positive effects that are maintained over time.

This study analyzed the function of two components of a personalized instruction course -mastery criteria for passing a test and assignment length. A high mastery criterion (100% correct) and short assignments produced better test performance than either a low mastery criterion (60% correct) or long assignments (four short assignments combined) on both study question items that students had in their possession and probe items that were not available to students in advance.

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Ten students in a personalized university course were given target dates for completing each of 26 lessons. The lessons could be completed before those dates, but not after. The first two failures to complete a lesson by the target date led to "warnings"; the next failure required the student to withdraw from the course. When each student's rate of lesson completion was compared with and without target dates, it was found that students completed an average of 1.0 lesson a day with the target-date contingency and 0.3 without it. Individual data indicated that most students did few or no lessons without the contingency. It was conduded that a target-date contingency is an effective method for maintaining student progress in personalized university courses. Keller (1968) described a system of personalized instruction suitable for higher education that is now being widely used in many fields (PSI Newsletter, 1970). This system usually involves frequent testing of students over small portions of the course, the requirement that the student continue working on each section of the course until he demonstrates mastery, the use of students who have previously taken the course as proctors, and the possibility for the student to progress through the course at his own pace. A number of group-design studies have shown that this general methodology produces a higher average level of student performance on major exams