Why did Germany adopt the constructive vote of no confidence after the Weimar Republic?

Germany adopted the constructive vote of no confidence to address the extreme political instability that plagued the Weimar Republic (1919–1933). During that period, frequent cabinet collapses and the lack of a stable parliamentary majority made the government highly vulnerable.1

Under the Basic Law established in 1949, the constructive vote of no confidence was designed to ensure government continuity. Unlike traditional parliamentary systems where a government can be ousted simply by a majority expressing disapproval of the prime minister, the German Bundestag can only remove a chancellor if it simultaneously elects a successor by an absolute majority.21

This mechanism prevents the creation of a power vacuum and reduces the likelihood of a government being unseated without a viable alternative in place. By requiring the legislature to agree on a replacement, the system discourages the kind of fragmented, shifting alliances that contributed to the collapse of democratic governance in the interwar era.21