Testing changes · The power · Element
The duration
How long it runs.
The part
What it is
Set in advance and adhered to. Stopping when the result looks good is the most common way a test is invalidated.
Covering whole weeks, since behaviour varies by day and a partial week biases the result.
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.