The slack

How much room the other paths have.

The part

What it is

A path with two days of slack is nearly critical and will become critical after one delay.

Watching only the current critical chain misses the path that is about to become it.

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.

Slack
How much this path could slip without affecting the date.
Duration shared type
Near critical
Whether it is close to becoming the constraint.
Choice shared type
Path
Which sequence this is.
Reference shared type