A fictional multidisciplinary clinical reasoning simulator for practising differential diagnosis, scope-aware reasoning, and supervisor-guided reflection.
Differential diagnosis is one of the most important skills in clinical reasoning, but it is difficult to learn by reading alone.
A good differential is not just a list of possible diseases. It is a working structure for thinking under uncertainty. The learner has to notice what fits, what does not fit, what remains dangerous even if it is less likely, what new information would change the ranking, and when the reasoning has narrowed too early.
That is a lot to hold at once.
Students often have to develop this skill while also managing medical knowledge, history-taking, examination findings, investigations, uncertainty, and the pressure to arrive at “the answer.” Early learners may know some conditions but struggle to organise them. More advanced learners may generate possibilities but close too quickly, overvalue one finding, order tests without a clear reasoning purpose, or fail to revise when the case changes.
The Differential Diagnosis Studio creates a safe fictional practice space for these skills.
It helps learners slow the reasoning process down, work with cases at different levels of support, practise building and revising a differential, and receive supervisor-style feedback on the reasoning process itself.
For medical learners, this may mean forming a fuller diagnostic differential. For allied health, nursing, paramedicine, pharmacy, and care-adjacent learners, it may mean forming a scope-aware differential, recognising unsafe or out-of-scope features, and deciding when referral, escalation, monitoring, or handover is required.
The aim is not to replace clinical teaching, textbooks, supervision, or real patient experience.
The aim is to give learners more opportunities to practise the part that is often hardest to see clearly – how a differential is built, tested, prioritised, revised, and applied within professional scope.
For fictional educational use only.
The Differential Diagnosis Studio is not a diagnostic chatbot, symptom checker, triage tool, treatment planner, or source of medical advice.
Open the Differential Diagnosis Studio
What it is
The Differential Diagnosis Studio is an Elderwell learning tool for medical students and appropriate clinical-reasoning learners.
It helps users practise the reasoning process behind differential diagnosis: forming an initial list, keeping likely and serious possibilities in view, asking useful questions, requesting relevant examination findings, choosing investigations for a reason, and revising the differential as new information appears.
The goal is not to guess the hidden diagnosis as quickly as possible.
The goal is to build a better diagnostic reasoning process.
What it helps you practise
The Studio helps learners practise:
- building an initial differential
- distinguishing likely from must-not-miss possibilities
- asking discriminating clinical questions
- requesting relevant examination findings
- choosing investigations for a reason
- revising when new information appears
- avoiding premature closure
- tolerating uncertainty
- explaining why diagnoses move up, move down, remain active, or drop away
- documenting reflective learning through optional CPD-style notes
Professional-frame reasoning
The Studio can also adapt cases to different learner roles or professional frames.
Not every learner is working toward the same diagnostic endpoint. A medical student may practise building a fuller medical differential, while a physiotherapist, chiropractor, nurse, paramedic, pharmacist, occupational therapist, speech pathologist, dietitian, podiatrist, exercise physiologist, or aged-care support worker may need a different kind of reasoning task.
In these frames, the goal may be a scope-aware working differential, recognition of serious or out-of-scope possibilities, referral or escalation thresholds, handover-quality reasoning, or a decision about whether the case remains suitable for that professional role.
The shared learning discipline remains the same: compare alternatives, keep serious possibilities visible, revise when new information appears, and avoid premature closure. The endpoint changes according to the learner’s role.
Four learning modes
The Studio offers four learning modes. Each mode changes how much support the learner receives and how much of the diagnostic process they must manage independently.
Each mode changes what part of the diagnostic reasoning burden the learner carries.
Foundation Mode reduces recall burden. The learner works with curated diagnostic options and practises sorting, ranking, justifying, and revising them.
Beginner Mode reduces navigation burden. The case unfolds in stages, so the learner can focus on updating the differential after history, examination findings, and investigation results.
Intermediate Mode shares navigation responsibility. The learner decides what to ask for, examine, investigate, and revise, with light support if the process stalls.
Advanced Mode removes most scaffolding. The learner carries the full reasoning task: eliciting, investigating, prioritising, interpreting, maintaining alternatives, and revising under uncertainty.
The aim is not to make the case artificially easy. The aim is to transfer responsibility gradually, so learners can practise the specific part of diagnostic reasoning they are ready to strengthen.
The basic progression is simple:
Foundation reduces recall burden. Beginner reduces navigation burden. Intermediate shares navigation responsibility. Advanced gives the learner the full reasoning task.
Case mode and supervisor mode
The DDS has two main states.
Case mode
In case mode, the Clinical Educator holds the fictional case and provides information according to the selected learning mode.
In Foundation and Beginner modes, the case may unfold through structured stages. In Intermediate and Advanced modes, the learner takes more responsibility for asking questions, requesting examination findings, choosing investigations, and revising the differential.
Supervisor mode
After the case, the learner can ask for feedback, debrief, scoring, or deeper review.
The supervisor assesses the reasoning process, not the learner’s personality or real-world clinical competence. It can review differential breadth, prioritisation, question quality, examination requests, investigation use, revision discipline, premature closure, threshold recognition, and whether alternative pathways were genuinely kept alive.
Optional deeper reviews include turn-by-turn process audit, moment-of-shift analysis, counter-pathway analysis, strongest-move analysis, consolidated scoring summary, and cognitive-signature analysis.
CPD and reflective learning notes
When requested, the Studio can also produce a brief CPD-style reflection note based on a fictional case session and supervisor feedback.
This can help users document the learning activity, reasoning skills practised, key feedback, reflection, and future development focus. It may be useful for personal learning records, reflective practice, or professional development documentation.
These notes do not certify competence, award CPD hours, confirm accreditation, or replace any professional association, employer, regulator, or training-program requirement. They are reflective records of fictional educational practice only.
Who it is for
The Differential Diagnosis Studio is intended for medical students, health-profession learners, clinicians, educators, and appropriate care-adjacent learners who want structured practice in differential reasoning.
It may be useful for:
- early learners practising diagnostic categories and prioritisation
- medical students learning to revise a differential as new information appears
- allied health learners practising scope-aware clinical reasoning and referral thresholds
- nursing, paramedicine, pharmacy, and care-adjacent learners practising deterioration, escalation, medication-risk, handover, or change-from-baseline reasoning
- clinicians using fictional cases for reflective professional development
- educators exploring AI-supported clinical reasoning practice
What it is not
The DDS is not:
- a medical advice tool
- a symptom checker
- a triage tool
- a treatment planner
- a diagnostic engine
- a general medical teaching engine
- an accredited CPD provider or certification of professional competence
- a substitute for textbooks, clinical teaching, supervision, or medical care
- a tool for analysing real symptoms, real test results, or real patient cases
It works only with fictional educational cases.
If you have a real health concern, real symptoms, test results, or concerns about another person’s health, seek appropriate medical care.
How to start
You can begin by choosing a learning mode, a broad medical domain, and an optional reasoning focus.
Example prompts:
“Foundation Mode, musculoskeletal, focus on sorting likely and must-not-miss diagnoses.”
“Beginner Mode, general medicine, focus on avoiding premature closure.”
“Intermediate Mode, endocrine/metabolic, focus on investigation choice.”
“Advanced Mode, infectious disease, open simulation.”
“Supervisor mode — give me a debrief on my reasoning.”
“Intermediate Mode, physiotherapy frame, musculoskeletal, focus on referral threshold.”
“Intermediate Mode, pharmacist frame, focus on medication-related differential and escalation.”
“Intermediate Mode, paramedic frame, focus on threat recognition and handover-quality reasoning.”
“Beginner Mode, nursing frame, focus on deterioration and expected versus concerning change.”
“Supervisor mode — give me a CPD-style reflection note from this session.”
If you are not sure where to start, try:
“Beginner Mode, undifferentiated general medicine, general differential reasoning.”
Public testing note
The Differential Diagnosis Studio is being shared as a public educational prototype.
Feedback from medical students, clinical educators, and clinical-reasoning learners is welcome, especially around:
- case realism
- level calibration
- usability
- supervisor feedback
- clarity of boundaries
- whether the Studio helps learners practise better differential reasoning
Created by Elderwell
The Differential Diagnosis Studio was created by Marc Croker as part of The Elderwell Initiative.
First published: 10th May 2026
Last updated: 10th May 2026
© Marc Croker / The Elderwell Initiative
The Elderwell Initiative creates thoughtful AI mentors, studios, and reasoning experiences for deeper reflection, clearer thinking, and wiser judgement.