After reading this, I thought that it was nothing new under the sun, as Christensen have written on the subject, and is a lot more thorough and a better writer. Then it dawned on me that this was written in the beginning of the nineties, which should be credited to the author. Unfortunately, he didn't manage to draw the long-term conclusions that Christensen does nor is it very well written, so I'll give it an OK for being ahead of its time, but failed on all other points.

You may read it for historical value.