Learn Test improvements against task completion and inspect who gets excluded.
Start with everyday situations, predict an outcome, and test your ideas. You need basic arithmetic, percentages and graph reading; explanations introduce additional ideas where needed. No coding or account is required. Every investigation has school, college and workplace extensions—you can choose any of them.
Investigate a user task, author a prototype, diagnose exclusions and prioritize a testable product increment.
Open any topic directly. Review functions and graphs whenever useful.
The original two-investigation starter remains available. Choosing the full course adds its published lessons to your selected scope; your earlier work stays saved. Skipping does not count as completion or understanding.
Free exploration: no completion scope selected yet. Project reports and independent evidence are tracked separately.
Choose a unit, then open a lesson on its own page. This outline lists the sequence; it does not combine the full lessons into one page.
Choose task evidence and distinguish interest, usability and commitment.
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How do recruitment and question choice change the evidence?
Ten fictional participants differ in experience. Task failure rates are supplied teaching assumptions, not measured interview outcomes.
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Is stated interest enough to justify building the whole product?
Separate fictional cohorts answer a survey, attempt a prototype or join a reversible trial at a stated price. No transaction occurs.
Build a navigation flow and inspect task success across input methods.
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Which control actually reaches the learner’s saved work?
A small deterministic screen-flow prototype exposes the destination of each action. It is not a prediction of user behavior.
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Can a faster average conceal a design failure?
Four authored task observations compare a pointer-only menu, a basic accessible revision and a streamlined revision. These fixtures are not real usability study data.
Find subgroup regressions, compare funnel improvements and plan work within capacity.
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Does an improvement for one group hide harm to another?
Replay fixed keyboard and touch tasks on three fictional prototypes. Development cases are reused and openly visible.
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Do equal percentage-point improvements produce equal results?
Synthetic course signup funnel. Visitors may sign up, then signed-up people may finish a task. A repair adds 10 percentage points to exactly one stage.
○ Not marked complete · Included · Practice check available
Which work fits the available days and addresses observed failures?
Three whole jobs address disjoint fictional task failures. A chosen priority order accepts each job that fits remaining capacity.
Design and revise a small flow that helps a learner resume an investigation. Submit the user problem, original and revised screen flows, task script, outcome table and prioritized next increment. Textual screen prototypes are valid artifacts.
Save a report, compare captured evidence, and attempt three new cases. A completed report records submitted work; the rubric supports a separate human review of its quality.
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