Flexible sequence format. You can choose pages from 3 major Higher positions and shifting; Keys and scales; Bowings and special techniques. Essential Technique for Strings is a book of studies to help the intermediate player develop the skills necessary for playing in an orchestra. It is designed as a multi-use technique book for use within a string orchestra setting. It is organized so that you can use the various sections in the book in the way that's best for your individual needs.