I do not need Excel constantly, so the knowledge does not sit so deep. The tutorial is great because I was able to perform it according to your mood and thus could bring out the "forgotten knowledge" again. The learning chapter describes excellent in almost all lessons. The aid program is designed ingeniously. A big advantage is that you can at your own pace, without any stress, learn. (One is and flexible in time) Much better than some VHS courses. The other educational CD's for Office programs I will certainly buy myself yet.