Testers see three versions of a scene: which order avoids favouring one?

Whatever version a tester sees last or first gets an unfair edge, through freshness or through novelty. This entry makes a schedule in which every version appears in every position equally often and follows every other equally often.

Why this works

Whatever a person sees first or last gets an unfair edge from novelty or freshness. You cannot remove the effect, but you can spread it evenly so that every version gets its share of good and bad positions and the effect cancels in the comparison.

When not to use it

Do not bother when each tester sees only one version, which is a cleaner test anyway, or when testers are so few that the schedule cannot be completed. Then simply show one version to each person and compare the groups.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 32 lines of example code with 4 checks that pass
• How your AI shows you that it works

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Use the Spielerando entry "Testers see three versions of a scene: which order avoids favouring one?" (read_entry balanced-order-for-scene-versions) in my game. Build it step by step, and show me how you checked that it works.

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