New · March 2026
Sustainable Futures Lab
McKinsey’s newest module — a behavioural assessment with 13 sequential decisions, no calculations, and judgement under pressure as the only thing being measured.
A live preview of our SFL simulations — built specifically for the new 2026 module.
What is the Sustainable Futures Lab?
Sustainable Futures Lab (SFL) is the third and newest module in McKinsey’s Solve assessment, introduced in March 2026 as part of the 85-minute version of the test. Unlike Redrock and Sea Wolf — which evaluate analytical reasoning and optimisation — SFL is a behavioural assessment.
You’re placed inside an environmental research team and asked to make a series of connected decisions as a project unfolds under time pressure. There are no maths problems and no data models. Only your judgement, your consistency, and your ability to think clearly when the evidence is incomplete.
As of April 2026, SFL is live for candidates receiving 85-minute Solve invitations across the US, UK, Germany, the Middle East, Southeast Asia, and Canada — with a global rollout in progress.
Why candidates struggle
1
Consistency over correctness. Your answers are scored as a pattern, not individually. Candidates who optimise question-by-question often get a worse overall score than those who hold a clear point of view throughout.
2
No “right” answers. Every question presents legitimate trade-offs. The test is your reasoning, not whether you happened to pick the textbook option.
3
Limited prep material. SFL launched in 2026, so structured practice is scarce. Most online prep is still oriented at Redrock and Sea Wolf — which is why our SFL simulations exist.
What candidates say
★★★★★
“The SFL module was the one I was most worried about because there’s not much out there on it. The simulations here are the closest I found to the real thing. The scoring breakdown is especially useful — helps you understand what they’re actually looking for.”
Aisha M.King’s College London · 2025
★★★★★
“I had 6 days between getting the invite and the assessment. Found PSG Solver on the second day and basically did nothing else. Passed. Would recommend to anyone who’s short on time and needs something structured fast.”
Sofía R.IE Business School · 2026
★★★★★
“I was completely lost before finding PSG Solver. After one week of structured practice, I finally understood the logic behind the tasks. Worth every dollar.”
Gabi V.Stanford University · 2025
SFL Practice Tests
3 simulations. Built for the 2026 module.
Three full SFL practice runs covering all five evaluation dimensions, with explanations for what good judgement looks like at every decision point.
£24.99£49.99
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