Analyzing and tracking decisions long term- do you?

[Scott Passman]

I keep an excel spreadsheet detailing all of my investment decisions, RE and non-RE, as a tool for me to use long-term to update and analyze my decision making skills. The way I have it outlined is very simple using 4 columns:

-Investment decision- outline what I did or did not do

-Why I think it is a good decision- Write down all the factors, variables, and assumptions I’m using to justify my decision and why I think it’s a good move.

-Why it may be a bad decision- Analyze what could go wrong or what assumptions could prove false, internally or externally, and how that may affect my investment.

-Result- periodically updated since things can change over a period of months/years/decades.

I am only 33 years old, and hopefully have many decades of investing left in me, so I want to form a good understanding of how I’m making decisions and track long-term how those assumptions play out. My goal is to identify common areas where I either make mistakes, poor assumptions, show information bias, use data improperly, or when I followed/didn’t follow gut feelings and how that worked out. By identifying these characteristics about my decision making process, I know it will help me in the future to be aware of these biases and blind spots which can allow me to account for it and ultimately lead to better decision making skills. How do you guys track your decisions long-term? I’m always open to improving upon this spreadsheet so I’m interested in learning what others are doing to keep track of these things and periodically return to analyze, evaluate, and learn from prior decisions.