Contents, line 4. For ‘1972’ read ‘1975’. Page 53, bottom line. For ‘Caption on opposite page’ read ‘Caption overleaf’. Page 57, bottom line. For ‘Caption on opposite page’ read ‘Caption overleaf’. Page 98, line 17. For ‘M.S<inf>3</inf>’ read ‘M.Sc.’. Page 99. Lines 1–25 ‘Employers should … form and content’ should follow line 16, p. 98 ‘… basis for regulations’.
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A 1976 study studied this question.