Yves, Q-charts are described in  SPC Methods for Quality Improvement by Charles Quesenberry.  They entail plotting Q statistics, rather than the traditional mean, range, number of defects, etc.  There were some rancorous discussions of their merits during the fall of 1998 in Quality Progress.  The first 30-35 pages of the book give a lot of good information about general quality improvement practices.  Lou Hart 412-858-6184

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From:   Yves.Dupuis[SMTP:[log in to unmask]]
Sent:   Friday, October 06, 2000 5:02 PM
To:     [log in to unmask]
Subject:        [TN] Q-charts

There was a posting on this list a while ago concerning Q-charts in SPC (no
replies I believe). I have not had much luck locating info on Q-charts. Does
anyone know if they have another name ? Or can an online reference be
suggested ?

Yves Dupuis
Leitch Technology

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