After the Knowledge book came out, there was a considerable drop in the number of Bible studies.
There are two reasons for this:
The Knowledge book is shorter in length than the Live Forever. After 6 months the book was done. 1 chapter a week.
Bible studies were to discontinue after the Knowledge. No other book to be studied (no more of the old United in Worship book).
Later the Governing Body 'understood' this program was not really working. Slowly the number of Bible studies increased when they put a stop to the 6-month study arrangement and introduced the Require brochure as a bible study starter. Longer studies meant more baptisms. With the new and thicker Bible Teach book replacing the Knowledge book, and now studying the new Worship book after it, Bible studies have increased signinficantly and so has baptisms.