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Rca Classical Methods

Category: General  ·  Sub-category: operations  ·  Last updated:
Classical root cause analysis techniques for quality improvement and incident investigation. Covers 5 Whys (with Card's 2017 critique and boundary conditions), Ishikawa/fishbone diagrams, Fault Tree Analysis (FTA), Failure Modes and Effects Analysis (FMEA), Cause Mapping, and Doggett's method-selection framework. Use when investigating a failure, running a post-incident analysis, building a fishbone, calculating fault tree cut sets, running an FMEA pass, or deciding which classical technique fits the problem. Not suitable alone for complex socio-technical failures — escalate to rca-systems-theoretic or rca-causal-inference when the incident has multiple interacting causal chains.

From the source SKILL.md

Classical root cause analysis techniques are the inherited toolkit of quality and reliability engineering. They are best understood as a family with different strengths and known failure modes — not as interchangeable recipes. This skill teaches when to reach for each one, how to run it rigorously, and when to stop and escalate to a more capable method.

What this skill does

Rca Classical Methods is a community-contributed Claude Code skill in the operations sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/rca-classical-methods/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when investigating a failure, running a post-incident analysis, building a fishbone, calculating fault tree cut sets, running an FMEA pass, or deciding which classical technique fits the problem. Not suitable alone for complex socio-technical failures — escalate to rca-systems-theoretic or rca-causal-inference when the incident has multiple interacting causal chains.

Who uses this skill

The Rca Classical Methods Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/rca-classical-methods
curl -L https://claudskills.com/skills/rca-classical-methods/SKILL.md \
  -o ~/.claude/skills/rca-classical-methods/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/rca-classical-methods/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/rca-classical-methods/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\rca-classical-methods\SKILL.md on Windows. See the full install guide for step-by-step instructions.

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Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). Rca Classical Methods [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/rca-classical-methods/
BibTeX
@misc{rca-classical-methods-2026,
  author    = {ClaudSkills},
  title     = {Rca Classical Methods [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/rca-classical-methods/}
}

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