

Above: Eastern knitting uses an Eastern mount (left leg out) and wraps yarn clockwise.


Above: Western Knitting (Continental and English) uses a western mount (right leg out) and wraps the yarn counter-clockwise. Portuguese knitting and the Norwegian purl fall into this category.
If we pair our mounts and wraps consistently, there are no twisted stitches. It's interesting to see that the Norwegian purl is simply a counter-clockwise wrap entering a Western mount in a Continental/English needle direction. That's why it can be paired with a Continental or English knit stitch without twisting. It's really a Continental/English purl with some extra maneuvers before it grabs the yarn.
Portuguese knitting, as demonstrated on the video above, shows the yarn coming from around the neck and toward the needles. But the stitch mounts are Western, the needle directions are Continental/English, and the wraps are counterclockwise, so it's basically Continental/English knitting without having to hold the yarn--you simply move it into place with your thumb or index finger.
Combination Knitting
This is a common knitting style that combines Eastern and Western knitting. See the Knitting Help page to learn more about this. Scroll down to “combined purling.” It’s purling Continental/English style, but wrapping clockwise, then knitting farside (into the back loop) as you would to correct a twisted stitch. Many people around the world knit this way.
All three techniques, Eastern, Western, and Combination produce beautiful, untwisted knitted fabric.