Case Lab · F20-F29

Fictional F20-F29 cases. Each case requires a decision before revealing the full answer, and every response gets specific feedback — including why the near-miss alternatives are weaker.

40 of 40 cases shown

• Type A A change over two months

  Recognition / application · Difficulty: Foundation · F20

• Type B Odd for years, or newly unwell?

  Boundary / differential · Difficulty: Boundary · F20

• Type C One week in

  Insufficient information · Difficulty: Developing · F20

• Type D New information changes the picture

  Progressive revision · Difficulty: Transfer · F20

• Type E Just one voice

  Misconception correction · Difficulty: Foundation · F20

• Type F Sorting the evidence

  Explanation / evidence selection · Difficulty: Boundary · F20

• Type A Odd since her teens, unchanged for a decade

  Recognition / application · Difficulty: Foundation · F21

• Type B A diffuse odd pattern, or one fixed belief?

  Boundary / differential · Difficulty: Boundary · F21

• Type C Odd for as long as anyone can remember?

  Insufficient information · Difficulty: Developing · F21

• Type D A stable pattern, then something new

  Progressive revision · Difficulty: Transfer · F21

• Type E Just an unusual hobby

  Misconception correction · Difficulty: Foundation · F21

• Type F Sorting the evidence — a decade-long pattern

  Explanation / evidence selection · Difficulty: Boundary · F21

• Type A One belief, two years, otherwise unremarkable

  Recognition / application · Difficulty: Foundation · F22

• Type B A belief that arrived with a roommate

  Boundary / differential · Difficulty: Boundary · F22

• Type C Six weeks in, one fixed idea

  Insufficient information · Difficulty: Developing · F22

• Type D The picture broadens

  Progressive revision · Difficulty: Transfer · F22

• Type E A dramatic belief, otherwise unremarkable

  Misconception correction · Difficulty: Foundation · F22

• Type F Sorting the evidence — one belief, one household

  Explanation / evidence selection · Difficulty: Boundary · F22

• Type A Three days, a lost job, and a shifting picture

  Recognition / application · Difficulty: Foundation · F23

• Type B Acute, dramatic — and a substance history

  Boundary / differential · Difficulty: Boundary · F23

• Type C Three days in, severe but new

  Insufficient information · Difficulty: Developing · F23

• Type D Past the expected window

  Progressive revision · Difficulty: Transfer · F23

• Type E A frightening first episode

  Misconception correction · Difficulty: Foundation · F23

• Type F Sorting the evidence — fast onset, shifting picture

  Explanation / evidence selection · Difficulty: Boundary · F23

• Type A A belief that arrived with a relationship

  Recognition / application · Difficulty: Foundation · F24

• Type B A shared belief — but is it only shared?

  Boundary / differential · Difficulty: Boundary · F24

• Type C Two people, one belief, unclear order

  Insufficient information · Difficulty: Developing · F24

• Type D A belief older than the relationship

  Progressive revision · Difficulty: Transfer · F24

• Type A Voices, a persecutory belief, and a manic pattern

  Recognition / application · Difficulty: Foundation · F25

• Type B Low mood after the voices stopped

  Boundary / differential · Difficulty: Boundary · F25

• Type C Voices and a mood that's hard to read

  Insufficient information · Difficulty: Developing · F25

• Type D The mood picture turns out milder than it seemed

  Progressive revision · Difficulty: Transfer · F25

• Type E Understandably shaken, still schizophrenia

  Misconception correction · Difficulty: Foundation · F25

• Type F Sorting the evidence — psychosis and mania, weighed together

  Explanation / evidence selection · Difficulty: Boundary · F25

• Type A Eight months of one consistent, isolated feature

  Recognition / application · Difficulty: Foundation · F28

• Type B Persistent, but no delusion at all

  Boundary / differential · Difficulty: Boundary · F28

• Type C Unusual, but only six weeks in

  Insufficient information · Difficulty: Developing · F28

• Type A An unidentified man, no history, first contact

  Recognition / application · Difficulty: Foundation · F29

• Type B Actually, there's enough to say more

  Boundary / differential · Difficulty: Boundary · F29

• Type C A secondhand report, nothing more

  Insufficient information · Difficulty: Developing · F29

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All cases are fictional educational scenarios. See About and Safety.