Taproot Root Cause Tree Dictionary Pdf

The TapRooT® Root Cause Tree® Dictionary is not just a glossary; it is a structured, evidence-based reference that defines every generic root cause within the TapRooT® system.

While the physical TapRooT® Root Cause Tree® is a visual “map” (a laminated, color-coded chart) that helps investigators navigate from a symptom down to a root cause, the Dictionary serves as the detailed instruction manual. It provides:

Before diving into the dictionary, we must understand the system it serves. TapRoot was developed in the late 1980s by System Improvements, Inc., founded by Mark Paradies and Linda Unger. Their breakthrough was recognizing that most root cause methods were too vague.

The TapRoot system is built on three core documents: taproot root cause tree dictionary pdf

The dictionary is not an afterthought. It is the lexicon of truth for an investigation. Without it, two investigators looking at the same evidence might code the same problem under different categories. With it, consistency and rigor prevail.


Many modern root cause analysis software platforms (e.g., ThinkReliability’s Cause Map, or Sologic) allow users to attach custom PDFs. Having the TapRoot dictionary as a PDF means you can hyperlink definitions directly into your digital investigation files.

The Dictionary is designed to eliminate ambiguity. When an investigator reaches a decision point on the Root Cause Tree®, they cannot rely solely on intuition. The Dictionary provides: The TapRooT® Root Cause Tree® Dictionary is not

Note on PDF Availability: The TapRooT® Root Cause Tree™ Dictionary is proprietary intellectual property. While visual representations of the Tree are widely available, the full text of the Dictionary is typically restricted to participants of TapRooT® training courses or license holders. "PDF" versions found online are often unauthorized or are excerpts provided in course workbooks.

Due to copyright and version control, do not trust random file-sharing sites (e.g., taproot root cause tree dictionary pdf download free from a .ru domain). These are often outdated (pre-2015) and missing hundreds of updates.

Official Sources:

Cost Expectation: The standalone PDF dictionary typically ranges from $75 to $150 USD, while the full investigation kit (Tree, Dictionary, Helper) is around $300-$400. Consider this an investment—one prevented major accident pays for this a thousand times over.

Example Entry from the PDF:

Cause: Communications Content Missing (Under the “Communications” branch) Definition: Essential information needed to perform a task safely was not included in work orders, shift handovers, or emails. Examples: A work order stated “Fix pump P-101” but omitted that the pump was radioactive. Verification Question: Was the task attempted using incomplete information that should have been provided by another person? The dictionary is not an afterthought

Avoid: Scribd, course-sharing sites, or any “free PDF download” link that is not the official vendor. Not only is it legally risky, but you also lose support and updates.


Incidents don’t happen in boardrooms. They happen on the plant floor, at a construction site, or in a control room. A PDF can be loaded onto a tablet, laptop, or even a ruggedized smartphone. Unlike a spiral-bound book, a PDF is searchable (Ctrl+F) and never gets lost.