We have a summer student seminar series in the science and engineering departments here, running two days a week at lunchtime with three students each day giving 15 minute presentations on their summer research projects to other students and faculty.
The student talks are split almost 50/50 overall on whether to provide an outline at the start of the talk or not. About half of the students put up a slide listing the component parts of their talk (“First, I’ll give some motivation for the experiment, then I’ll talk about the apparatus, then…”), and about half jump right into the talk, identifying the sections as they go (“The motivation for this experiment comes from…”). I have my own opinion on this question, but I thought I’d throw this out as an audience poll to see what people think:
Seminar series are most definitely classical environments, so please choose one and only one option.