The Investor Decision Journal

Stop Guessing. Start Tracking Why You Invest.
Most investors cannot clearly explain why they bought their last stock. This workbook fixes that. The Investor Decision Journal is a structured template you complete before and after every investment.
It forces you to:
Write your thesis in plain language
Determine a stock's fair value before you buy it
List the exact assumptions that the investment case depends on
Identify what would prove you wrong
Set pre-commitment sell rules
Review your performance every 6 months
It turns investing from “I think this is good” into documented reasoning.
 
Why It Works
When your logic is written down:
You stop buying on impulse
You catch weak assumptions early
You build conviction based on evidence and thorough analysis
You learn from every decision
Over time, patterns appear. You’ll see:
What types of businesses work for you
Where you consistently overpay
When you get emotional
Which assumptions tend to fail
That feedback loop is your edge. Most investors never create one.
What You Actually Get
A printable and reusable structured framework that includes:
Investment Snapshot Sheet
Thesis Builder
5-Criteria Investment Criteria
Assumption Tracker
Risk Assessment via inversion
Expected return model
Emotional bias check
Pre-commitment sell triggers
Bi-annual review system
Post-exit performance review
You use it every time you deploy capital. No exceptions.
Who This Is For
Long-term stock investors
Beginners who want structure
Intermediate investors tired of emotional decisions
Anyone serious about compounding capital over decades