of the Symposium on Operating Systems Principles, 1969." As usual, I would like a summary, followed by a separate section containing your reaction. As I continue to read your submissions, in many cases the summaries are better than the reaction sections, in the sense that they were given more attention, or they are so commingled that I can't tell the summary and reaction apart. Please physically separate the two sections (using 'Summary' and 'Reaction' headings would be a good way to do that) and give some serious, critical thought to what you have read.