Watch the A Dorian Mode online guitar lesson by Brad Carlton from Guitar Lab: Dorian Dominance
This lesson will take what you've learned in the previous lesson, the traditional seven scale forms, and turn them into three note per string scale forms. The same system of labeling will be applied and if you've learned the traditional forms, you will have no trouble turning them into three note per string forms. These layouts are one of the most commonly used in modern guitar playing as they are especially useful for triplet scale patterns. Notice how you will be moving in a diagonal line from left to right as you play each scale form.
As you study the A Dorian mode, you will notice patterns emerging with regard to adjacent notes in the scale. Be sure to memorize the intervallic pattern of this scale. All you need to remember is that the half steps occur between the 2 and b3 and also between the 6 and b7. All the other scale degrees are a whole step apart. This means that if you're viewing groups of three adjacent scale tones, they will fall into the following patterns: whole step half step (1 2 b3 and 5 6 b7), half step whole step (2 b3 4 and 6 b7 1), and whole step whole step (b3 4 5, 4 5 6, b7 1 2).