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Traditional exit interviews are - sorry to say - usually a waste of time.  Remember in particular that employees leave managers rather than companies, so management interviews are unlikely to uncover true motivations.

But cost of turnover is a nightmare for many companies.  Just look at your recruitment budget, then consider the lost contributions, the wasted training cost and the management time.
 

Consider supplementing your regular exit interview data with participation in the RealDifference project - an independent research programme which aims to understand the differences in values and attitudes between people who stay and those who leave.