CHANGE NOTICE #20 - 12/99

New Edition of Wave 3 (1993-1994) WLS Sibling data and documentation.

A new edition (DPLS edition 3) of the third wave WLS data has been released.

If you received third wave data before December 1, 1999, please read this notice.

Summary of the Wave 3 - 9/99 (released 12/1/99) update (see below for details):

The THIRD edition of the 1993/94 WLS siblings differs from previous releases in the following way: