This study investigated self-presentation bias in the self-reports of teachers about their practices in six topic areas in educational technology (Instructional Design, Assessment, Learner-Centered Instruction, Curriculum Alignment, Attitudes about Computers, and Use of Computers with Students). Subjects were 50 middle-school teachers. Data were collected using a 30-item Likert-type survey containing five items per topic area. Teachers responded to items in two forms: "what I do" and "what other teachers do." Significant differences favoring the "I" form were obtained in three of the six areas (Instructional Design, Learner-Centered Instruction, and Curriculum Alignment) and on nine of the 30 items, indicating a rather strong self-presentation bias. Responses were generally positive across both forms. Results are discussed with implications for working with teachers and for using additional assessment measures that complement teacher self-reports.