http://blog.lionbrand.com/2016/01/06/franklin-habits-friendly-three-point-message-to-journalists-who-seek-to-write-about-knitting-and-crochet/#more-35618
This is an excellent article by Franklin Habit on the difference between knitting and crocheting. How many times have you seen an item and it is listed as knitting and it is really crocheted or vice versa. He makes a good point all balls are not used for the same sport, so don't assume yarn is all used for the same craft.
