It depends. The SBV is administered in multiple item sets (hypothetically, up to five or six, but usually more like three), in ten different clusters. Each cluster has independent stopping points that are based on the number of points obtained in that item set. As long as you have obtained the minimum number of points necessary, you proceed to the next item set. Once your points for a set go below a certain number (two), you discontinue that particular cluster (but not the other ones). So it's not really a particular number of items incorrect in a row (which is how the WISC is, and most of the WJ and DAS).
