The acceptance

Confirmation that the owner agreed it was achievable.

The part

What it is

Assignment is not agreement. An owner who was told rather than asked will behave like someone who was told, and the commitment will not hold under pressure.

Recording the acceptance explicitly is a small ceremony that changes the psychology of the quarter.

The smallest level

The attributes it carries

Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.