| Number needed |
| Legal minimum |
| Voting minimum |
| Meeting minimum |
| Business minimum |
| Minimum attendance |
| Business necessity? |
| Enough for a meeting |
| Parliamentary number |
| Senate voting concern |
| A concern of the chair |
| Number needed for official business |
| Minimum number required to transact business legally |
| Minimum number of members required for a meeting to be legitimate |
| Minimum required number of members present for conducting business |