The results of a number of experiments with the memorizing of several different subject-matters are presented in such a way that the relationship between number of opportunities for error (word elements faded) and number of errors actually made can be observed for individuals and groups. The particular selection of word elements to be taught by fading in each trial is the parameter within each subject-matter. This report contains a number of separate sets of results, each of which is presented in graphic form. The data are presented as illustration of the importance of certain variables and unimportance of others in the learning situation rather than as evidence of significant differences between conditions. The data suggest that relative strength of elements is a critical variable effecting errors on any particular trial and the number of trials needed to reach the criterion. In contrast, ordinal position (whether the beginning or the end of the chain is faded first) does not appear as a terribly important consideration. (Author)