Problem-Solving Tool Selection Guide

Choosing the wrong tool wastes time. Use this guide to match your situation to the best tool — or combination of tools.

Quick Selection Table

Your Situation	Best Tool(s)	Why
You don't fully understand the problem yet	5W2H	Gathers all facts before analysis begins
Problem is simple, cause is guessable	5 Whys	Fast root cause digging for straightforward issues
Many possible causes, hard to pinpoint	Fishbone Diagram	Visually maps all categories of potential causes
Multiple problems, limited time/resources	Priority Matrix / Pareto	Focuses effort on highest-impact issues first
High-consequence failure, safety or quality risk	Fault Tree Analysis	Traces all failure paths; used in regulated industries
You need creative solutions, not just root causes	Brainstorming / SCAMPER	Generates new ideas beyond the obvious
Choosing between multiple good solutions	Decision Matrix	Scores options against weighted criteria objectively
You want a structured improvement project	PDCA or DMAIC	Provides step-by-step project discipline
Recurring problem after fix was implemented	8D Report + 5 Whys	Structured containment + deep root cause
Complex system; failure has multiple causes	Fault Tree + Fishbone	Both top-down (FTA) and category-based (Fishbone)

Decision Path — "Which Tool First?"

Q1 Do I fully understand what the problem is?

☐ No → Start with 5W2H Investigation Form
☐ Yes → Go to Q2

Q2 Do I know what's causing it?

☐ No → Use 5 Whys (simple) or Fishbone (complex)
☐ Yes → Go to Q3

Q3 Do I know how to fix it?

☐ No → Use Brainstorming / SCAMPER / Decision Matrix
☐ Yes → Go to Q4

Q4 Is this a large or cross-functional problem?

☐ Yes → Use PDCA or DMAIC or 8D
☐ No → Implement and track with PDCA (mini)

Tip: Most real problems use 2–3 tools in sequence. Start broad (5W2H), then dig deep (5 Whys or Fishbone), then prioritize (Pareto or Priority Matrix), then solve (Brainstorming + Decision Matrix), then sustain (PDCA).

Notes — My Tool Choice for Current Problem

Problem	Tool(s) I Will Use	Reason