202020sääntöä
202020sääntöä is an informal heuristic discussed in Finnish-language online forums and informal writings. The term combines the numbers 20 and 20 with the Finnish word sääntöä, meaning “rule,” and is used to describe a simple rule of thumb intended to guide planning, estimation, and decision making in projects and policies. There is no formal standard or universally accepted definition, and variations exist in practice.
Most common formulations of 202020sääntöä propose evaluating a decision along three dimensions tied to the number
The term appears in online discussions and lightweight guides dating from the late 2010s and early 2020s,
Supporters view 202020sääntöä as a practical, easy-to-remember reminder to curb scope creep and to maintain discipline.