State of the Lab:

Training progress is good relative to expectations.
This is a living document that will receive regular updates and refinements.
All major sections now have something. The Concern section is still quite thin, more to come soon.

FJJ2 is not a comprehensive description of how grappling works.

It is a set of constraints that replace Technique and Position in BJJ, and a set of predictions on how complex skill-patterns will develop out of them.

I have this in big letters at the top because I sometimes forget this when talking to people, and exaggerate myself into a corner.

Techniques and positions can be played poorly. Despite this, they are the primary reference points we use to teach jiu jitsu.
Players are generally given a task, then are allowed to move their bodies in any way they choose. This allows players to trade strong spinal alignment for progress up the BJJ positional hierarchy, resulting in eventual loss of the position.
- Example: Player puts spine out of position in order to complete a pass from top guard to side control.

Techniques are used as the primary definer of drills, with the Uke modifying behavior to allow the technique. This should be reversed, where the situation is the primary definer and specific techniques are just optional solutions.
Players ignore "hidden jiu jitsu" because they are paying keen attention to Technique details.
Players lose position when transitioning to submissions because they are differentiating between positions, submissions, and transitions.
Core aspects of the language of BJJ add to the noise, making it harder to pick out the signal.

If I can continue to improve on the mat while only paying attention to FJJ Concerns
Then there may be ways of talking about grappling that are orthogonal to technique and position, and they may be useful.

Have players ignore technique and position
Define a small set of fundamental concerns
Train against these concerns
Consider Re-introducing technique only after the player feels safe in turtle positions
Testing Philosophy

Concerns are a method of reducing the degrees of freedom by restricting how players are allowed to think about situations. Instead of cutting off movement options, they redefine grappling such that there’s less things you could be trying to do. No techniques or positions are allowed unless they can be fully translated into the Concerns outlined below.
FJJ2 List of Concerns

Training FJJ2 predicts the following events will occur:

1+ years playing turtle trenches, learning to transition between them, learning to get submitted
Affordances for invading the opponent's Turtle Space will emerge while trying not to get submitted
Attacks similar to this are expected to emerge before a top game
The ability to get up will be built on the turtle positions
The ability to get up will force your lab partner to wrestle, creating sweep opportunities
Sweep and Top Position controls will be built on the controls required to get up
Top Position will emerge without being explicitly trained. Top Position can be played entirely as an extension from bottom position.