The best replacement for scenario is sensitivity analysis.

The best alternatives to scenario are rated as following:
★★★★★  sensitivity analysis
★★★★  use case
★★★★  scenario
★★★  test case
★★  scenario outline
★★  scene
★★  heroic scenario
★★  situation
★★  scenarios
★  speedball
★  vignette
★  worst case scenario
★  user story
★  b2 scenario
★  scenery
  worse
  worse case scenario
  simulation
  worst
  worse case

Your alternative for scenario is not listed? Suggest!
Speaking about scenario, one probably shouldn't forget about er diagram.

Other search terms related to scenario and their ratings are:
★★★★★ er diagram
You have in mind a companion for scenario and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of scenario in all years. Click on graph for more.
scenario
sensitivity analysis
use case