Twenty-one users of two existing procedural formatting systems were studied during a week-long course on a new tag-based system. Users’ performance on class exercises was monitored, and subjective reactions were assessed at several points in the process. Users were classified along two experience dimensions: formatting history, and intensity of use. Our analyses revealed that heavier users of the existing systems made more errors on the exercises; particularly common were omitted and extraneous commands. We also found that attitudes of the participants diverged over the five-day period as a function of formatting history, with the more sophisticated users becoming more negative, and the more casual users more positive.
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