Assume one or more undergraduate students are given a topic by an academic supervsior to use for their undergraduate honors thesis. The task is designed, programmed and set-up by the supervisor, who shows the students how to use the equipment and to conduct rudimentary data analysis/summaries. The students then collect the data and report them in a written, submitted thesis. Later, the academic supervisor analyses the data (from the summaries obtained), writes a manuscript in conjunction with his/her colleagues, and wishes to submit for publication. My question is: should the undergraduates who collected the data, and who did not contribute to the writing of the manuscript at all, be listed as authors? It seems that this decision is often left to personal preference.