In today's "Monday with Mounce" blog entry, "My Second Thoughts about Subjunctives in Purpose Clauses (Monday with Mounce 117)" (
http://www.koinoniablog.net/2011/10/mon ... e-117.html), ὁ διδάκαλος says, "I am starting to seriously question whether we should rethink the standard presentation of the subjunctive, specifically in ἵνα clauses." There is some interesting discussion here. If there were a comments section, I would recommend that he look at Margaret Sim's dissertation on ἵνα and ὅτι,
Marking Thought and Talk in New Testament Greek: New Light from Linguistics on the Particles 'hina' and 'hoti'
Carl W. Conrad
Department of Classics, Washington University (Retired)