Montessori 3 part (or "nomenclature") cards are used to teach a child the names of the various parts of something, in this case a fish. There are three cards for each part, a control card which has both the picture and the label, a card with only the picture and a card with only the label. The child’s job is to match the cards, (you can find more detailed instructions on how to give a 3 part card lesson when you search online). He learns the vocabulary of each part as he does this. Each part