Understanding Evaluation Types
Learn the difference between Side-by-Side (SxS) and Single-Sided Evaluations (SSE), and when to use each.
Side-by-Side (SxS) Evaluations
SxS evaluations present two experiences side by side and ask evaluators to rate each on the same dimensions. This format is ideal for A/B comparisons, redesign validation, and competitive benchmarking.
- Best for comparing two designs, prototypes, or live pages
- Evaluators see both experiences simultaneously
- Results show relative preference and per-dimension comparisons
- Supports randomized left/right presentation to reduce bias
Single-Sided Evaluations (SSE)
SSE evaluations assess a single experience on its own merits. This format works well for standalone quality audits, baseline measurements, and heuristic evaluations.
- Best for standalone UX quality assessment
- Evaluators focus on one experience at a time
- Results provide absolute scores per dimension
- Useful for tracking quality over time
When to Use Each
Quick Decision Guide
Use SxS when you have two options to compare (redesign vs. current, your product vs. competitor). Use SSE when you want to assess a single experience against a rubric or track quality over time.
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