Fixed points · The freeze periods · Element
The scope
What is frozen.
The part
What it is
Rarely everything. Usually systems, pricing, process and staffing changes that touch delivery.
A freeze covering everything is ignored within two years; one covering the right things is respected.
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.