Charlie99:PADI also has a variety of media, including videos for those that are more visually oriented. Read it in a book. See it in a video. Hear it from the instructor. Do it under his supervision. Hopefully, at least one of those teaching methods works for each individual.
I think most agencies now have multi media approaches to learning material. All the books have pretty color pictures and nice graphics. One thing I found annoying with the PADI text book was that every couple of pages there was an advertisement for something that would part you from your money---directly into PADI's bank account. I didn't like it 10 years ago and I still don't like it. IMHO a textbook is for learning from, not an advertising venue which is what most magazines are for.
NAUI's education kit includes text book, video, cassette tapes and a workbook. Classroom presentations are expected to build on what those venue's present to the student.