preliminary
Happening before the main event to prepare or test.
Preliminary means happening before the main event as preparation or to test something first. When your teacher gives a preliminary quiz, it's a trial run to help you prepare for the real test. When scientists conduct preliminary research, they're doing early investigations to see if their idea is worth pursuing further.
Think of preliminary steps as the warm-up before the game. Athletes do preliminary stretches before competing. Architects create preliminary sketches before drawing final blueprints. A preliminary outline helps you organize your thoughts before writing an essay.
Preliminary work happens in that before-stage: you're not fully committed yet, you're testing the waters and getting ready.
Sometimes preliminary results surprise people by changing completely in the final version. A preliminary vote might show one winner, but after all the votes are counted, someone else could win. That's why news reporters carefully say results are preliminary when counting isn't finished. The word reminds us not to jump to conclusions too quickly: preliminary findings are just the beginning of the story, not the end.