Decision Journals: Thinking Better Over Time
A decision journal captures what was known, believed, uncertain, and expected before the outcome arrives and rewrites the story.
Eric Springstun’s interest in documentation and decision quality includes the value of recording the reasoning behind important choices. Memory is excellent at simplifying the past. A short written record preserves the actual assumptions, alternatives, and uncertainty that existed when the decision was made.
What was known?
List the relevant facts, constraints, deadlines, and information available at the time. This prevents later knowledge from being smuggled backward into the original decision.
Why this option?
Record the alternatives considered, the tradeoffs, and the reasons one path appeared stronger than the others.
What might change the answer?
Name the assumptions, unknowns, and conditions that would justify revisiting the decision later.
A good decision can produce a bad result, and a bad decision can get lucky.
Judging a decision only by the eventual result can hide whether the reasoning itself was sound. A decision journal lets the later review ask a better question: given what was reasonably knowable then, was the process strong?
That distinction matters because the goal is not to create a perfect record. It is to improve the quality of future judgment by identifying which assumptions were accurate, which were weak, and which risks were underestimated.
Compare prediction with reality
What happened? What did not happen? Which variable mattered more than expected? Review turns the journal from an archive into a learning tool.
Look for recurring decision habits
Repeated entries can reveal overconfidence, unnecessary delay, neglected alternatives, useful instincts, or recurring blind spots that one isolated decision would never expose.
Keep it short enough to use and specific enough to teach.
A useful entry can be simple: the decision, the date, the available options, the key facts, the assumptions, the expected outcome, the main risk, and the condition that would trigger reconsideration. The value comes from consistency, not literary ambition.