The business thinking simulator.

Run Latchkey, an imaginary smart-lock company, or solve real business cases from Nike, Spotify, Rolex and more. Make the call and get deep AI feedback.

Explore the coursePlay a free case
Ten-chapter simulatorFifty real company casesFive-dimension AI feedback

Your only supplier is preparing to replace you.

The factory makes 100% of your product and is quietly looking for another distributor. Your move.

1971 · Nike · blind decision

Register by and keep individual access free forever.

50real business cases
278decisions to make
15simulations
August 2026editorial context

Start with the course or solve a business case.

Take the course for a connected journey. Open a standalone case when you want to practise on a real company.

The Business Judgment Course

10 connected chapters

Join Latchkey, an imaginary smart-lock company, as chief of staff. Make ten connected decisions through its emails, dashboards, meetings and board memos.

1company
10decisions
18methods
Enter the course

Real company business cases

50 published cases

Face one consequential decision before its outcome is revealed. Defend your call, receive a five-dimension review and compare with the historical fork.

50cases
15boards
5dimensions
Browse the case desk

Decide. Get deep AI feedback.

Start with the facts available at the time. Make the call, explain your reasoning and get feedback before the company’s decision is revealed.

  1. Enter the situation

    01

    Get only the facts, constraints, and uncertainty available at the time.

  2. Make the call

    02

    Choose a direction before the company’s decision or outcome is revealed.

  3. Defend it

    03

    Write a short decision memo with evidence, alternatives, and a tripwire.

  4. Review the reasoning

    04

    Get a five-dimension review by AI and the method that targets your weakest move.

  5. Compare with history

    05

    See the CEO’s fork and outcome, then take one useful method into the next case.

What you get.

One platform with a company simulator, real business cases, eighteen decision methods, AI feedback and a saved workbook.

01

A complete simulator

Ten connected decisions inside one fictional company, with eighteen methods taught where they are needed.

02

Real company business cases

Current, sourced decisions that stop before the answer is known, ready for transfer practice.

03

Scored feedback

Five named dimensions, twenty points each, with evidence for every score.

04

An AI decision review

A challenge to weak assumptions and a harder follow-up — not an answer to copy.

05

Real benchmarks

The historical call, the outcome, and a clear separation between process and luck.

06

A saved workbook

Your current memo, latest review, and every completed board run in one workbook.

Give every team member the same decision criteria.

Use the Latchkey course to teach one coherent process, then move into real company cases to practise transfer. Every participant decides in their own account; the live discussion turns different calls into team learning.

Explore the team programmeSee the learning flow

Course + case library · individual work · live debriefs

Corporate L&D

Build a shared decision process, then practise it across real company cases.

Consulting firms

Build a repeatable path from case evidence to a committed recommendation.

Corporate universities

Add a complete decision-practice track to the academy you already run.

Executive education

Prepare executives individually, then use the room for the hard trade-offs.

Business schools

Combine a continuous business simulator with current company decisions.

Show the reasoning behind your decisions.

decidenda cannot promise a job or salary. It gives you repeated practice and a record of completed work that you can discuss with a manager, teacher or interviewer.

Labour-market figures describe employer demand and an adjacent occupation; they are not a guarantee of individual hiring or compensation outcomes.

Your case log records completed work.

Your case log records completed cases, current answers, latest reviews and your current rating. A case counts only after every answer is filled and saved.

  • Every completed case has an answer to every question
  • A Business Judgment Rating with its evidence count
  • A public credential ID and LinkedIn handoff
  • High-resolution PNG and print-ready PDF
Open my case log

Companies in the case library

a sample of 50

NVIDIA, Hermès, Valve, Porsche, Red Bull, OpenAI and more — open the full case desk →

Join 2,000+ subscribers and followers of Business Case Weekly, across 100 countries

AMDGoogleValeNorsk HydroGlovoYandexProtivitiH&R BlockMAPFRE
Georgia TechBrownBard CollegeWebster UniversityUniversidad del DesarrolloEAFITBucharest ASEPUCPUniversidad ExternadoUSFQUDLAUniversidad MarianaUniversity of LahoreForman Christian CollegeINTIPutra Business SchoolRamkhamhaengUniversity of Kabianga

Company and institution names reflect reader email domains. Not an endorsement or affiliation.

Questions about access, scoring and feedback.

01What exactly do I get?

You get the ten-chapter Business Judgment Course, a growing library of real company cases, interactive decision boards, transparent AI feedback, historical benchmarks, a saved workbook, and a public case log.

02How much does decidenda cost?

decidenda is free for everyone until 15 September 2026. Register by that date and keep your individual access free forever.

03What is the difference between the course and the cases?

The course teaches eighteen methods through one connected year at Latchkey, an imaginary smart-lock company, so each decision builds on the last. Standalone cases change the company, evidence and stakes, helping you test whether the process transfers.

04Is there one correct answer?

No. Several calls can be defensible. Your reasoning is scored independently from the historical choice and outcome, so a strong dissent can beat a lucky match.

05How is my answer rated?

The reviewer assigns 0–20 points in five published dimensions: framing, evidence, alternatives, uncertainty, and commitment. Every score shows the evidence behind it.

See every scoring anchor
06How do I write a strong answer?

Use FRAME: Frame the decision, use Relevant evidence, compare Alternatives, Manage uncertainty, then Execute and learn. For example: choose a 90-day pilot, cite the demand signal, compare waiting, cap the downside, and name the metric that stops or scales it.

07Does matching the CEO improve my score?

No. The CEO is a historical benchmark, not the answer key. Matching the call earns nothing by itself, and disagreeing does not reduce the rating.

08Can I use hints?

Yes. Every question has a spoiler-free thinking hint and a short method lesson. Opening one labels the attempt Assisted practice; it never reduces the answer score.

09What do ten completed cases prove?

They show that you answered every question across ten cases. Reviews can show patterns in the reasoning you wrote; they do not predict real business outcomes.

010Will this improve my career or income?

decidenda gives you deliberate practice and a visible body of work that can make your reasoning easier to improve, discuss, and verify. It does not guarantee a job, promotion, salary, profit, or business outcome.

Start with the Latchkey course or Nike case.

Build the process across a year at Latchkey, or make the Nike call and get your first five-dimension review today.

Explore the coursePlay the Nike case