( sonal experiences. Still, these results suggested that there was a pattern to be learned by the responses to the posed question. Using the redundant pairs present in both preliminary rounds, we also evaluated intra-rater agreement between the chemists using the Cohen's κ C coefficient. With κ C1 = 0.6 and κ C2 = 0.59 for the first and second preliminary round, respectively, we conclude that that in most cases, all chemists displayed a fair degree of response consistency. Additionally, no specific positional bias on screen was detected for any of the preliminary participants, with preferences reasonably close to the expected random 50% baseline. Additional two-bytwo inter-rater agreement coefficients are presented in Figure , from which we draw similar conclusions. Overall, the results on the preliminary rounds suggested that there was indeed a signal to be learned from the opinions expressed by the chemists that had participated in the study up to that point. These findings convinced us to extend the study and continue with the subsequently presented, larger productionlevel runs.