Intended as a practical introduction to training for British business people whose jobs involve providing training but who are not full-time trainers, this document discusses the principles of effective instruction and the practical implications of such instruction. The introduction: (1) argues that effective instructors are made, not born; and (2) lists effective instructor style characteristics (developing a rapport with trainees, having a flexible approach to accommodate individual needs, and adapting to different types of learning). The bulk of the document explains effective instructor style techniques, which include having clear objectives, taking into account different kinds of learning, using alternative training strategies, recognizing that trainees have more than one learning need, talking less but more effectively, inviting participation, encouraging trainee independence, appraising progress, having strategies for error correction, diagnosing errors by questioning the trainee, checking the effectiveness of instruction, and using time well. The document concludes with a summary of good instructional practice and appendices that describe a study of instructor effectiveness, an explanation of methods to help prevent errors in what is to be learned, a quiz that asks readers when they would correct particular kinds of errors frequently made by trainees, and answers to the quiz. (CML)