You surely know how to dredge up the past. I spent many months working
on that study and used the results internal to IBM to justify a third
CPU for my time sharing complex. I got involved at the dawn of
satellite links which were a baddie no one wanted to know about.
Approximately 3/4 second signal propagation delay which, by itself, was
enough to cause noticeable attention loss for interactive users.
Chuck Norcutt
Amongst other things in previous lives, former end user support manager
for the IBM Kingston APL time sharing complex. Wow! 'twas a long time ago.
Moose wrote:
>
> A long time ago, IBM did a study of productivity vs. response time on
> timesharing systems. The results clearly showed that slow response times
> lead to reduced productivity way out of proportion to the difference in
> actual time spent waiting for the computer. It seems that there is a
> breaking point where the mind wanders and loses track of the task at
> hand, leading to reduced operator response times.
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