After an introduction which addresses some basic questions, this article is organized around three points: (1) The theoretical framework of the so-called "instrumental approach" which has been a theme in the last two CAME symposia; (2) A consideration of two processes ("instrumentalization" and "instrumentation") which interact in the "instrumental genesis"; and (3) The introduction of the idea of instrumental "orchestration" as a way of allowing the teacher to assist the student's instrumental genesis.