[Haskell] Articles on the value of strong typing

[Jacques Carette]

As far as published studies, I have found many through the Psychology of 
Programming Interest Group, which has a web site
http://www.ppig.org/
and an archived mailing list
http://www.mail-archive.com/discuss%40ppig.org/
with a fairly high density of reports on (formal) empirical studies on 
related issues.  Asking the question on their mailing list is likely to 
be return quite a few references to proper studies.

Jacques