Several common errors reflecting difficulties in probabilistic reasoning are identified, relating to ambiguity, previous outcomes, sampling, unusual events, and estimating. Knowledge of these mistakes and interpretations may help mathematics teachers understand the thought processes of their students. (MNS)

A common error in children's attempts to solve verbal analogies is to respond with a word strongly associated with the third term in the analogy. This is known as associative response. A study was conducted to investigate the cognitive processes underlying this response. Subjects, 112 fifth grade students, were administered a battery of tests…

A classroom exercise to help college students of economics conceptualize, create, and learn from graphs is described. The technique is illustrated with an exercise concerning the concept of supply and demand in consumer markets. Classroom time required for the activity is small, and students become adept at manipulating models without anxiety.…

Replicates an earlier study that used videotapes to examine the types of errors made by novice economics students in graphic analysis of a simple supply-demand problem. Further explores the issue by improving the framework for analyzing errors and documenting some methods used by novice groups to correct errors. (MJP)

Discusses the value of classifying the errors adult language learners make and of comparing them to errors made by children. It is suggested that teachers correct student errors in the same way parents correct children's errors in order to encourage successful learning. (CFM)