The right stripes
Step 1: WIDE STRIPES
On wide bands of colour it is best to cut the yarn each time you want to introduce a new shade. Simply start knitting with the new colour at the start of the next row.
Step 2: NARROW STRIPES
If the change happens frequently over bands of just a few rows then carry the yarn up the side of the work. To switch back to a previous colour, bring the old yarn up from underneath the current yarn