Here is a little something I've been working on. Care to add anything?
1. Every sequence has two parts. An attacking sequence and a defending sequence. The defending sequence is the part of the form that you see performed. The attacking sequence is the part of the form that is imagined by the practitioner when the form is being performed or analyzed.
2. Every movement has an application. From the slightest placement of the hand, to the turn of the body or limb, or the placement of a part of the body on another part, it all is indicating information that is vital to application.
3. Application can occur in 360 degrees around the defender. It is assumed by many that the application for a form sequence is occurring in the direction that the defender is looking. This is simply not the case. Often the head turning is indicating something completely different then what is assumed. The nature of the forms movements is revealed when you consider the movement from all angles. You will better be able to apply basic techniques in the context of the forms when you understand the moves in this fashion.
4. Every movement has at least three variations. This is more of a benchmark then anything because any movement can really have countless variations. The three rule comes from the okuden style of transmission in which every movement was broken down into a striking, grappling, and finishing movement as the form was learned and digested over time. These layers of application were treated as an arts mysteries and a student was gradually introduced to these layers when the teacher felt the student was ready. In Tang Soo Do, we do away with this distinction and teach them all simultaneously.
5. Every application is 2-5 movements and ends in superior position. Every application in a form will place the defender in control of the situation. Karate was not designed as a dueling art. It was designed for life protection and for real violence. There are no wasted moves in karate and no points. Or, as Oyata Sensei tells his students, no hurt, no down.
6. Every application starts and ends on the same movement. This guideline is very important as a student should be looking at every movement as the starting or ending of another application sequence. The amount of combinations for movements when viewed in this way is endless, thus the amount of applications are limitless.