Premortem

technique · management · organizing-schema

Imagine the project has failed and work backward to prevent the causes.

The Premortem is a prospective hindsight technique developed by decision-research psychologist Gary Klein, presented in a 2007 Harvard Business Review article 'Performing a Project Premortem'. The technique inverts the postmortem: at the start of a project, before commitment is locked in, the team is told to imagine that the project has failed catastrophically a year hence and to write down all the reasons why. The cognitive premise — drawing on Mitchell, Russo, and Pennington's 1989 'prospective hindsight' research — is that imagining a specific failure outcome and reasoning backward about its causes produces substantially more concrete and credible risk identification than asking 'what could go wrong?' The technique surfaces concerns that politeness, optimism, and group-think otherwise suppress, and is particularly effective in environments where dissent is socially costly. Daniel Kahneman has cited the Premortem as one of the most useful debiasing tools available.

Originators

Gary Klein (HBR formulation); Mitchell, Russo, and Pennington (cognitive precursor: prospective hindsight) high

Year / Decade

2007 (Klein HBR article); 1989 (Mitchell-Russo-Pennington prospective hindsight) high

Primary sources

Klein, G. (2007). 'Performing a Project Premortem', Harvard Business Review, Mitchell, D.J., Russo, J.E. & Pennington, N. (1989). 'Back to the Future: Temporal Perspective in the Explanation of Events', Journal of Behavioral Decision Making high

Core components

Imagined failure scenario at a specific future date
Prospective-hindsight cognitive frame
Individual brainstorming before group discussion (to limit conformity)
Specific cause identification rather than abstract risks
Mitigation planning following identification
Distinction from postmortem (forward-looking, pre-commitment)

Primary use case

Project risk identification before major commitments; debiasing tool against optimism bias and group-think; pre-launch reviews; complement to traditional risk assessments; structured surfacing of dissent in conformity-prone groups.

Common criticisms

Effectiveness depends on team's willingness to engage candidly — politically sensitive projects produce sanitized premortems
surfaces concerns but doesn't compel mitigation action
can become formulaic ritual once the team has been through several
cultural fit varies — some organizations interpret premortem participation as disloyalty
doesn't work well after psychological commitment has already been made
risk of over-identifying low-probability concerns and burying the real ones
works best with skilled facilitation.

Lineage

Siblings: After Action Review, Five Whys