CASPer and MMI interviews both ask applicants to show judgment under pressure, but they are not interchangeable. CASPer is a standardized online situational judgment test from Acuity Insights. An MMI, or multiple mini interview, is a school-run interview format made up of short stations.
For applicants who want structured support alongside this article, CASPer practice scenarios connects ethical reasoning, timed practice, and AI feedback in one CASPer prep routine.
For the broader CASPer timeline, start with the Ultimate Guide to CASPer. This article focuses on the specific CASPer vs MMI comparison: what each format feels like, how scoring works, and how to split your preparation time.
Quick Comparison
| Feature | CASPer | MMI |
|---|---|---|
| Main purpose | Assess professionalism-related judgment through timed responses | Assess communication, reasoning, and fit through interview stations |
| Typical timing | Before or during application review, depending on program requirements | Determined by each school |
| Setting | Online, standardized test platform | School-run interview process |
| Interaction | No live interviewer follow-up | May include school-specific prompts, instructions, and follow-up |
| Response mode | Video and typed responses | Spoken responses to school-designed stations |
| Scoring | Program-facing CASPer result from Acuity Insights | School-specific scoring rubrics and interviewer evaluations |
The overlap is real: both can test empathy, ethics, fairness, communication, self-awareness, and problem solving. The difference is delivery. CASPer rewards clear thinking in a tightly timed, non-interactive setting. MMI stations reward clear thinking plus live presence, listening, adaptability, and recovery after follow-up questions.
What CASPer Looks Like
For most 2026-2027 applicants, CASPer includes 11 scenarios: 4 video-response scenarios followed by 7 typed-response scenarios. Each video-response scenario has 2 questions, shown one at a time, and you have 1 minute to record each answer. Each typed-response scenario has 2 questions shown together, and you have 3.5 minutes total to type both answers.
The full test typically takes about 65-85 minutes. There is an optional 10-minute break after the video section and an optional 5-minute break after the first 4 typed-response scenarios.
CASPer scenarios may be video-based or word-based. The important part is not whether the prompt is dramatic or ordinary; it is whether you can identify the conflict, consider the people affected, avoid assumptions, and explain a fair next step.
What An MMI Looks Like
An MMI is less standardized across schools. One program may emphasize ethical reasoning, another may emphasize communication, reflection, teamwork, or mission fit. Because details vary, applicants should read each school's interview instructions instead of assuming every MMI uses the same station design.
Because MMI format varies by school, you should avoid preparing for it as if every station will look like CASPer. CASPer has no live interviewer, no back-and-forth, and no opportunity to clarify your answer after the timer ends. In an MMI, your answer may need to adapt to the school's prompt structure and any follow-up the station includes.
Timing And Logistics
| Question | CASPer | MMI |
|---|---|---|
| Do you schedule it yourself? | Yes, through the Acuity Insights process for the relevant test type and date | School-specific; follow the interview instructions from that program |
| Can you add schools later? | Yes, if the program is still accepting scores and uses the same test type | Not applicable in the same way; interviews are school-specific |
| How soon do programs receive results? | Usually about 2-3 weeks after the test | Depends on the school’s interview review process |
| Can you retake it in the same cycle? | Generally only once per test type per admissions cycle | Interview retake policies are school-specific and should not be assumed |
If you are managing CASPer logistics, review how score delivery works before you test. PrepTrack’s guide to How to Send CASPer Scores explains the distribution process, and Can You Add Schools After Taking CASPer? covers the main post-test scenario applicants worry about.
Scoring Differences
CASPer responses are evaluated by trained human raters. Each scenario is scored by a different rater, and responses are anonymized before evaluation. Typed and video responses are combined into one overall program-facing result. Applicants do not receive a detailed numerical score; they usually receive a quartile about 4-5 weeks after the test.
MMI scoring is school-specific. Schools can use their own station rubrics, evaluator processes, and admissions priorities. Because schools do not all score MMI stations the same way, treat MMI preparation as interview preparation, not as a second CASPer.
How Preparation Overlaps
| Shared skill | CASPer application | MMI application |
|---|---|---|
| Ethical reasoning | State the conflict and choose a fair next step quickly | Explain your reasoning while staying open to discussion |
| Empathy | Acknowledge affected people without overdramatizing | Show active listening and appropriate tone in real time |
| Communication | Be concise in video and typed answers | Speak clearly, organize your answer, and respond to follow-ups |
| Self-awareness | Admit limits and avoid pretending to know facts not in the prompt | Reflect honestly on mistakes, growth, and uncertainty |
| Professionalism | Balance compassion, boundaries, and accountability | Maintain composure across stations, even after a difficult prompt |
A good CASPer answer often follows a simple pattern: identify the issue, name the competing concerns, gather relevant information, avoid unfair assumptions, and propose a reasonable action. That same structure helps in MMI stations, but the delivery must sound conversational rather than scripted.
How To Split Your Prep
Start with the shared reasoning skills. Practice reading a scenario and naming the central tension in one sentence. Then practice giving a balanced response that considers more than one person’s perspective. This work helps both CASPer and MMI.
After that, separate the formats. CASPer prep should include timed video responses and timed typed responses, because pacing is part of the test. Use the free practice test in your Acuity account and complete the system checks before test day.
MMI prep should include live speaking when possible. Practice explaining your reasoning out loud, listening carefully, and adapting without sounding defensive or scripted.
If you are still confirming whether a program uses CASPer, use Schools That Require CASPer as a starting point, then verify requirements through Acuity Dates and Fees, the program page, and the school admissions page.
Common Mistakes
The first mistake is treating CASPer like a full MMI rehearsal. CASPer can strengthen ethical reasoning, but it does not fully replace live interview practice.
The second mistake is treating MMI as a performance instead of a reasoning exercise. Polished delivery helps, but vague answers still fall flat. Admissions interviewers need to understand how you think, not just that you sound confident.
The third mistake is overusing memorized frameworks. A light structure is useful. A rigid script can make your answer sound disconnected from the actual prompt.
Related CASPer Resources
- PrepTrack CASPer prep
- CASPer practice test
- Ultimate Guide to CASPer
- CASPer Registration Guide
- CASPer Test Format and Instructions
- CASPer Test Dates and Score Release Dates
- Schools That Require CASPer
Final Takeaway
CASPer and MMI preparation overlap, but they should not be collapsed into one study plan. Use CASPer prep to build fast, fair, structured judgment. Use MMI prep to turn that judgment into live conversation, flexible follow-up, and steady interview-day performance.