There are three types of Japanese script: katakana, hiragana, and kanji. It is possible to read Japanese knowing only a limited number of kanji, but it is not possible with only a limited number of katakana or hiragana - one must know all of them.
Let's Learn Katakana, and its companion volume Let's Learn Hiragana, is a textbook that introduces the learner to the basics of one of these fundamental Japanese scripts. Being a workbook, it contains all the exercises that allow the student to master katakana by the time the book has been finished.
Written by Yasuko Kosaka Mitamura.