An Overview of the Senate's Amendment Trees

The Senate's amendment process evolved over the years and is based on a continued interpretation of past parliamentary practice. Those precedents stipulate the nature of amendment that may be offered at a particular point in time (i.e. first or second degree; perfecting or substitute).

Which amendment tree the Senate is following at a particular point in time is determined by the first amendment offered to the legislation under consideration.

Chart 1: Amendment to Insert Text


Chart 2: Amendment to Strike Text


Chart 3: Amendment to Strike and Insert (Substitute for Section of a Bill)


Chart 4: Amendment to Strike and Insert (Substitute for a Bill)