In his inaugural lecture, Hardjono (1999) compared attempts at defining quality to catching mumsels. They do not exist, but you still try to catch them.
This book shows that the theme still has his attention. Together with Van Kemenade, he makes an admirable attempt to obtain a grip on quality. Whether or not this attempt has been fully successful yet remains to be seen, as it may be all too easy to classify a colorful variety of things under the four paradigms.
Below, I want to try to stand on their shoulders and understand more about quality.