From book:

The vibrant zigzag pattern of this extra-long scarf is emphasized by brilliant color changes, made possible by increasing and decreasing the stitches at regular intervals in double crochet.

Skill Level: Beginner

Pattern requires 6 colors of Patons Diploma Gold DK, 2 balls each of Colors A, B, D, E and F; 1 ball of Color C.

So Simple Crochet uses US crochet terminology.
Simple Stylish Crochet uses UK crochet terminology.