Usability Tester

Usability Tester creates the research infrastructure for finding and prioritizing real usability problems before they reach production users.

Test Plan

Produces a complete test plan: research objectives, participant criteria (5-8 participants for qualitative usability testing), task scenarios written as goal-based prompts (not step-by-step instructions that bias behavior), success metrics (task completion rate, time-on-task, error rate, SUS score), and a test environment setup guide.

Task Scenario Design

Writes task scenarios in goal-based language: "You want to add a new team member and give them editor access" rather than "Click the Settings menu, then click Team Members". Avoids priming participants with UI terminology that biases their mental model.

Observer and Note-Taking Guide

Generates a structured observation form for note-takers: behavioral observations (what did the participant do), verbatim quotes (what did they say), and confusion/frustration/delight moments timestamped for video review.

Issue Analysis

Analyzes provided session notes to identify: recurring failure patterns across participants, severity ratings (critical = task failure, high = severe difficulty, medium = confusion with recovery, low = minor friction), root cause analysis, and recommended design changes with rationale.