Completeness
Since 0.5.0.
What it means. Whether one copy of a set has everything it should: Complete, Incomplete, Sealed (never opened), or Not checked when nothing is recorded yet.
Roughly how it is calculated. You can choose the value yourself, or let Brick Work work it out. Worked out, a copy is Complete once it is marked "Set is checked" and none of its parts or minifigures is missing or damaged; otherwise it is Incomplete. Spare parts and the parts inside its minifigures do not count, but a missing whole minifigure does.
How to read it. It is about this copy, not the set: two copies of the same set can differ. Incomplete with no missing parts usually means the copy has not been checked to the end yet.
What changes it. Finishing Set Inspector, marking parts or minifigures missing or damaged, allocating a part from an order or loose stock to the copy, or ticking "Set is checked". A value you chose yourself stays as chosen until you change it.
Exact definition: Reference › Completeness. The words used here: Sets, copies, lots and stock.