Yet another member of the Reagan administration is leaving government to pick up the pen, but Education Secretary William Bennett's book is expected to focus more on policy and less on personality.

Bennett, the outspoken head of the Education Department since February 1985, said Monday he will resign in mid-September to write a book about the nation's education establishment.Spokesman Loye Miller said Bennett is working on a book contract, and "if there is demand for it, he will talk on the lecture circuit pretty much as he is now, but he will get paid for it for a change."

The book, said Miller, will be Bennett's "very candid" view of American education and not a "kiss-and-tell" book about the administration.