Week 4: The Decision Journal
Building Your Thinking Record
For three weeks you've been making predictions and noting surprises. Now it's time to formalize your thinking tool — the Decision Journal.
Writing down your reasoning BEFORE you see the result is the most powerful technique for becoming a better decision-maker. The Decision Journal prevents your brain from rewriting history and forces you to be honest about what you actually knew and thought at the time.
We also meet our first named cognitive bias: hindsight bias — the "I knew it all along" feeling that makes us think past events were more predictable than they actually were.
- This week is half practical (setting up the journal) and half conceptual (hindsight bias).
- The journal template should feel easy to use, not burdensome. If the student seems overwhelmed, simplify it.
- Hindsight bias is the first "named" brain shortcut. Frame it as a discovery, not a criticism — "Isn't it cool that our brains do this?"
- From this week forward, every week includes a specific journal prompt. The journal is now a permanent part of the course.
Week at a Glance
| Prep time | ~10 minutes |
| Materials | Decision Journal notebook (or digital document), journal template card, a short story with a surprise ending |
| Key vocabulary | hindsight bias, prediction, confidence level, reflection |
| Difficulty | Introductory |
Facilitator Preparation
- Prepare a clean Decision Journal notebook (or set up a simple digital document)
- Write out the journal template on a card or print it for easy reference
- Prepare a short story with a surprise ending for the hindsight bias activity (see Session 2)
- Review previous journal entries with the student
The journal should feel like a thinking companion, not homework. If it starts feeling like a chore, it is too complicated. Simplify ruthlessly. Even one sentence of reasoning before a decision is infinitely better than nothing.
For Younger Learners (Ages 8–9)
Simplest version of the concept: "Your brain tricks you into thinking you always knew what was going to happen. Writing things down BEFORE they happen stops the trick."
What to shorten or skip:
- Use a simplified 3-field journal template: "What I chose," "Why I chose it," and "What happened." Skip confidence levels and numbered predictions for now.
- For the hindsight activity, use a very simple story or a familiar movie with a twist ending.
- Keep sessions to 20 minutes.
Adapting the journal:
- The journal can be a simple notebook with sentence starters glued or written on the first page.
- Sentence starters: "I chose ___ because ___." and "I was (very sure / pretty sure / not sure)."
- Oral entries dictated to the facilitator count. Drawings count. Short answers count.
- Confidence ratings can stay as Low / Medium / High rather than percentages.
What success looks like: The learner makes one journal entry this week without needing heavy prompting, and can say in their own words why writing things down BEFORE helps.
- Use the full journal template with all seven fields, including confidence levels and probability estimates.
- Push for detailed reasoning: "Why did you lean toward that option? What evidence did you consider?"
- Encourage reviewing past entries and looking for patterns in their thinking.
Guided Session 1
The Journal Deep Dive
Learning Goal
By the end of this session, the student can:
- explain why writing down reasoning before an outcome matters
- use the Decision Journal template for a practice entry
- articulate one reason the journal helps them think better
Activities
1. Why Write It Down?
Ask the student:
"Think about a test you took recently. Before you got your grade back, were you worried or confident? Now that you know the grade, does it feel like you always knew how it would go?"
Discussion:
- Our memories play tricks on us. Once we know what happened, it FEELS like we always knew it would happen.
- The journal fixes this. It's a snapshot of what you actually thought at the time.
- Professional poker players, athletes, and scientists all keep journals for exactly this reason.
2. The Journal Template
Introduce the official template. Write this on a card or the first page of the journal:
📓 DECISION JOURNAL ENTRY
Date: _______________
1. THE DECISION
What choice am I facing?
2. MY OPTIONS
What could I do? (List at least 2)
3. MY REASONING
Why am I leaning toward one option?
What information am I using?
4. MY PREDICTION
What do I think will happen?
5. MY CONFIDENCE
How sure am I? (0-100% or Low/Medium/High)
6. [LATER] THE OUTCOME
What actually happened?
7. [LATER] MY REFLECTION
Was my reasoning good?
Would I decide the same way again?
Which box on the 2x2 grid does this land in?
3. Practice Entry
Do a practice entry together about a fun, low-stakes decision:
- Which game to play next
- What snack to have
- Which book to read
Walk through each field together. Emphasize:
- Fields 1-5 are filled in NOW (before the outcome)
- Fields 6-7 are filled in LATER (after you see what happened)
- The gap between "now" and "later" is where the magic happens
Guided Session 2
The Hindsight Trap
Learning Goal
By the end of this session, the student can:
- explain hindsight bias in their own words
- give an example of hindsight bias from their own experience
- explain how the Decision Journal helps counteract it
Activities
1. The Story Twist
Read or tell a short story that has a surprise ending. Before the ending, pause and ask:
"What do you think happens next?"
Record their prediction. Then reveal the ending.
Now ask:
"Looking back at the clues in the story, does the ending feel obvious now? Like you should have seen it coming?"
Most will say yes! That feeling of "I should have known" is hindsight bias.
Key point: The clues only feel obvious AFTER you know the answer. Before the answer, they were mixed in with a bunch of other details that could have pointed anywhere.
2. Famous Hindsight Examples
Discuss these kid-friendly examples:
- Sports: "Of course they won — they had the better team!" (But people picked the other team before the game.)
- Weather: "Obviously it was going to rain — look at those clouds!" (But the forecast said only 30%.)
- Tests: "That question was easy — I can't believe I missed it." (But in the moment, you weren't sure.)
For each example, ask: "Is this person being fair to their past self?"
3. The Journal as a Hindsight Shield
Return to the student's earlier journal entries from Weeks 1-3.
- Look at what they predicted vs. what happened
- Are there any entries where the outcome now feels "obvious" even though they weren't sure at the time?
- This is the journal doing its job: showing you what you ACTUALLY thought, not what your brain now tells you you thought
Discussion:
"Your brain is like an auto-editor that makes the past look neater than it actually was. The journal is your original, un-edited draft. That's why it's so valuable."
"Hindsight bias is just ONE of many shortcuts your brain takes without asking permission. Starting next week, we'll discover a whole toolkit of them — and learn how to spot each one."
Independent Practice
Goal
Set up the Decision Journal as a regular habit and practice identifying hindsight bias.
Activities
1. Journal Setup
If not already done, set up the permanent Decision Journal:
- Dedicate a notebook (or create a digital document)
- Copy the template onto the first page or inside front cover for quick reference
- Number the pages (optional but helpful for looking back later)
Quick-start version (younger learners): A simple notebook with the 3-field template ("What I chose / Why / What happened") written or taped on the inside cover is enough. Don't worry about numbering pages or creating a complex system — keeping it simple makes it more likely to get used.
2. Hindsight Spotter
Think about the past week. Find two moments where you (or someone else) said something like:
- "I knew that would happen"
- "That was so obvious"
- "I should have seen that coming"
For each one, ask yourself honestly: "Did I really know? Or does it just feel that way now?"
Decision Journal
Make your first "official" full entry using the complete template:
Choose a real decision you're facing this week — something where you genuinely don't know how it will turn out. Fill in fields 1-5 now. Leave fields 6-7 blank for next week.
Younger learner version: Use the 3-field template instead. Tell a grown-up: "I'm deciding ___. I chose ___ because ___. I think ___ will happen." The facilitator writes it down. Come back next week to fill in what actually happened.
Reflection Questions
- Why is it so hard to remember what we actually thought before we learned the answer?
- If someone says "I knew that would happen," what question could you ask them?
- How many weeks of journal entries do you think you'll need before you start seeing patterns in your thinking?
Quick Mastery Check
After this week, check whether the learner can:
- Explain the journal's purpose: "Why do we write down what we think BEFORE we see what happens?" (Looking for: "So we can't trick ourselves" / "So we remember what we really thought" / "Because our brain changes the memory.")
- Name the bias: "What is hindsight bias?" (Looking for: "Thinking you knew something all along" or "Your brain rewriting history.")
- Make a real entry: The learner completes one full Decision Journal entry (at their level) about a real upcoming choice.
If the learner can do #1 and #3, they've completed Phase 1's foundation successfully.
This week completes Phase 1: Foundations. You now have the core toolkit — randomness, process vs. outcome thinking, probability, and the Decision Journal. Starting in Week 5, we build on these foundations to explore the mental shortcuts (biases and heuristics) that shape every decision we make.
Pause and Notice
After the Hindsight Trap session, ask:
"When you found out the end of the story, did it feel obvious? Did you feel silly for not guessing it?"
"Has anyone ever said 'I told you so' to you? How did that feel? Were they being fair?"
Hindsight bias isn't just a thinking error — it can make us feel bad about ourselves ("I should have known!") or unfair to others ("They should have seen that coming!"). Recognizing hindsight bias helps us be kinder to ourselves and to other people when things don't go as expected.
This week's takeaway: "I should have known" is almost never fair — to yourself or to anyone else.
Spiral Review
- From Week 1: "Remember how you couldn't predict the coin flips? Hindsight bias is your brain pretending you COULD have predicted them — after seeing the result."
- From Week 2: "The 2×2 grid helps here too. When you look back at a journal entry and the outcome seems 'obvious,' check: were you actually in the Good Process box or just rewriting history?"
- From Week 3: "This is why confidence ratings matter. Writing '60% sure' BEFORE the result is your shield against hindsight bias."
If the full seven-field journal template feels like too much, start with just three fields: "What I chose," "Why I chose it," and "What happened." Build up to the full template over the next few weeks as the habit takes hold.
Have learners review all their journal entries from Weeks 1–3, score their predictions for accuracy, and calculate a simple calibration rate. Challenge them to write a "Letter to Future Me" explaining their reasoning on a current decision, to be opened in four weeks.