I bought this awhile back for my 3 (now 5) year old. I think I started a little late with her because she didn't really like watching the DVDs. I decided when I had my son that I would start playing the videos for him at 7 months and he is now 22 months and knows ALL letters, numbers, colors and shapes by recognition. I have flash cards now and mix them all up and he knows them all without hesitation!! I owe it all to Pre School Prep DVDS. DEF A MUST BUY!!!!