Book excerpt: (String Method). Introducing the Positions , a series widely used in classroom and private studio, represents a critical "next step" for string students. Position playing allows players to extend range beyond the basics and move into the ranks of intermediate and advanced ensemble groups. The most important positions vary for each instrument, and Whistler wisely introduces the most-used positions first in Volume 1, followed by the next most important in Volume 2. An irreplaceable component for every string student's training!