This book quickly gets the reader to play simple but imprssive enough music to get this person confident in one's abilities and interested enough to continue.
It also does a good job in easing a beginner into reading basic musical notation by starting with a more simply and intuitive version of it.
My only complaint is that the difficulty of the exersize passages picks up very sharply about half way through with no excersizes suggested that will get one's skill up to par. Playing earlier passages over and over simply does not do it. As a result, I had to look for the excersize information elsewhere.