The official "TapRooT® Root Cause Tree Dictionary PDF" is copyrighted by System Improvements, Inc. Searching for a free full version of the official copyrighted PDF is piracy. However, the company and other safety bodies offer free introductory chapters, sample dictionaries, and extracted tools —which is what experienced investigators search for.
The is the companion reference that defines each possible root cause code and generic cause listed in the Tree diagram.
Developed by human performance experts, the dictionary contains questions that a specialist would ask, such as those related to fatigue, job design, or equipment usability.
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Since many government agencies (like the DOE or NRC) use TapRooT®, technical reports often include detailed excerpts from the dictionary as part of their incident findings. Why the Dictionary is Essential for RCA
Methodology evolves. Ensure your PDF matches the version of the Root Cause Tree your company currently uses.
If you want to tailor this approach to your specific industry, please let me know: The official "TapRooT® Root Cause Tree Dictionary PDF"
Focuses on mechanical failures, design flaws, and material degradation.
Operator did not detect the small conveyor misalignment before it caused a major jam. Day 2: Using the Dictionary Instead of guessing, Sarah turned to the Root Cause Tree® Diagram . It pointed her to a specific section: Human Performance Difficulty right arrow Work Environment right arrow Lighting/Visibility She opened the TapRooT® Root Cause Tree® Dictionary to that section and read the questions aloud: Was the incident caused by excessive glare? Was the incident caused by inadequate lighting? ...She paused.
The Dictionary removes this bias. It provides exact, objective definitions and yes/no questions for every node on the tree. If your incident meets the specific criteria listed in the dictionary, you select that root cause. If it does not, you move on. This ensures that two different investigators looking at the same data will arrive at the exact same root causes. The Structure of the Root Cause Tree The is the companion reference that defines each
The power of TapRooT® lies in the interaction between the and the Root Cause Tree® Dictionary . They act as a GPS for investigators, steering them away from cognitive biases and toward actionable system improvements. 1. The Root Cause Tree®
Under the Human Performance branch, the dictionary guides you through specific categories: : Were they available, accurate, and followed?