Working the whole page all at once is key, by keeping in mind masses and tonal value. This technique is like painting 'alla prima' while working from larger masses to smaller details, because it creates while it plans. This is the best way to learn, beginning with how to place the figure properly on the page, saving time from redoing large parts because of an improper start.
The step by step approach with over 200 illustrations makes it easy to follow along. Not only is this the most efficient approach, it's the most exciting, achieving immediate progress with the greatest chance for accuracy.
The traditional practice of teaching the beginner to draw, using lines, only encourages bad habits which single them out as an amateur, while providing no special advantage over the approach in this book.
I recommend this book for all levels. For the beginner it is essential to first learn these principals of working with masses instead of lines, so telltale of the amateur. For the more advanced artist, there are many techniques useful to refining their skill.