In my new position, my activity would be very different from what it had been in past years. Then, working alone or, at most, with the help of a few students I would build the instruments, take them to the place where they had to be used, make the measurements and analyze the results. Now, I had the responsibility of an entire group, and what mattered was not my own work, but the work of the group. My task was to identify the most promising research programs among those that were within our reach, to help where help was needed in the planning of the instrumentation or in the evaluation of experimental results, all of this without discouraging the individual initiative of the researchers.