Define
CTQ Tree Builder (CTQC)
Turn customer needs into clear, measurable requirements and operational definitions.
Learning topic
Quality improvement and root cause analysis
Translate needs into measures, investigate causes with evidence and understand process variation.
A customer need, a possible cause and an observed association are different kinds of information. Define the requirement first, collect comparable observations and test explanations before choosing a countermeasure. Statistical tools add evidence when their assumptions fit; they do not turn a hypothesis into a verified cause.
Start with the question
Connect process mapping, root cause analysis, measurement and control tools to the questions they can actually answer.
Lean Six Sigma tools explained: choose the question firstGuides and corresponding tools
Each guide includes practical steps and fictional worked examples. Tool pages explain what you can create with the matching interactive worksheet.
Analyze
Root Cause Analysis Tool
Investigate causes with evidence, cause trees, validation and linked 5 Whys.
Analyze
5 Whys
Move beyond symptoms. Follow the evidence to a testable root cause.
Analyze
Fishbone / Ishikawa
Explore possible causes, organize the evidence, and verify what drives the problem.
Measure
Pareto Analysis
Find the categories that contribute most, with transparent totals and cumulative impact.
Measure
Data Collection Plan
Carry CTQC definitions into practical collection methods, sampling plans and ownership.
Control
Control Chart Builder
Build chart-specific SPC analyses with frozen baselines and documented special-cause signals.
Analyze
Process Capability Analysis
Compare observed variation with explicit specifications and documented distribution assumptions.
Analyze
FMEA
Review failure modes, controls, configurable risk scoring and proposed actions.
Define
SMART Goals
Define measurable goals and track dated actuals without confusing progress with verified results.
General
A3 Problem Solving
Bring the problem, evidence, countermeasures, and results together in one clear report.
Continue learning
Process mapping and workflow analysis
Understand process boundaries, map decisions and examine queues before changing the work.
Explore this topicStandard work and sustaining improvements
Document a tested method, assign monitoring and prepare clear reactions when performance changes.
Explore this topic