YesterdaysWeather (martinfowler.com)
This is the principle that says you'll get as much done today as you got done yesterday.
「昨日完了させたのと同じだけ今日完了させるだろうという原則」
In iterative projects it says that you should plan to do as much this iteration as you did last iteration.
「反復プロジェクトでは、直近のイテレーションで完了したのと同じだけ今回のイテレーションでも計画するべきということ」