プログレッシブ和英中辞典(第4版)の解説
そうてい【想定】
an assumption
想定する assume, suppose ((that; 「a thing [a person] to be))
私はあくまで勝つという想定で事を運びます
I am proceeding on the assumption that we will win.
強い地震がその地方を襲うという想定で訓練が行われた
The drill was based on a (simulated) scenario in which a powerful earthquake hits the area.
想定の範囲内[外]だ
It is within [beyond] 「the scope of our expectations [the expected limits].