Graphic elicitation, i.e. asking participants to draw, is an interview technique used to focus the interviewee on the given topic or gain extra meaning not covered verbally as part of the interview. This study analyses two interview contexts which included visual elicitation. It describes a successful example in which the researcher maintained control over the mode of the planned research task (diagram) as well as another example in which slippage occurred between the mode of the planned research task (drawing) and the resulting artefact (diagram). Through this analysis, strategies for maintaining researcher control over the mode of elicitation are identified, increasing our understanding about the theory and practice of both drawings and diagrams as two "different" modes of visual elicitation. The paper concludes that the required control does not necessarily comprise an increase in task structure (directing participants as to "how" to draw). Moreover, the subject and purpose of the task are equally important. Successful researcher control then comprises a careful balance between all the three aspects of purpose, structure and subject. (Contains 1 table, 3 figures, and 5 notes.)