It is fairly well-known among set-theorists that Keith Devlin's 1984 book "Constructibility" has flaws in its initial development of fine structure theory. (See Lee Stanley's review 1 of the text for the Journal of Symbolic Logic, for example.) I've had the book on my shelf for twenty years now, and although there is much in there that I find interesting, the fact that I know there are some errors in it means that I've been reluctant to invest a lot of time working through it. So, this brings me to my questions for the experts:

How badly do these flaws mar the rest of the book? Is the damage localized to the initial development of properties of the the J-hierarchy, or is it much more widespread?

Of particular interest to me are the following questions:

1) Is Devlin's treatment of the Covering Lemma for L on solid ground?

2) What about his treatment of morasses?

I know that there are other sources for this material, but I've always appreciated Devlin's writing style.

Trans. of the Amer. Math. Soc., Vol. 317, No. 1 (Jan., 1990), pp. 91-126) - link: jstor.org/stable/2001455 – Asaf Karagila Oct 10 '11 at 20:19