Production · The cost per format · Element

The cost per useful month

Cost divided by how long the piece stays useful.

The part

What it is

This reverses the ranking more often than not. The format that looks expensive per piece is frequently the cheapest thing the organisation makes.

It also makes the case for refreshing rather than replacing, because a refresh extends the denominator at a fraction of the numerator.

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.