Abstract
With graduate training only in literary research methods, the author built a successful career focused on issues of student plagiarism. Gradually, however, she came to realize that her claims about plagiarism were based on local observation and personal experience; they could not persuade wide audiences. Late in her career, she began doing large-scale, data-based research that allows her to persuade wider audiences; the data-based research has also challenged and revised some of her earlier claims about plagiarism.