Lean Six Sigma Yellow Belt Control and Sustainment Methods 1 Flashcards
6 cards from real Lean Six Sigma Yellow Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Lean Six Sigma Yellow Belt Control and Sustainment Methods 1 flashcards as text
What is the primary purpose of a Control Plan in the Control phase of DMAIC?
Answer: To specify what process variables to monitor, how to measure them, the sampling frequency, and the response if limits are exceeded
A Control Plan is a structured document that defines which key inputs and outputs to monitor, the measurement method and frequency, acceptable limits, and the required response action when a process goes out of control — ensuring improvements are maintained.
Which type of control chart is most appropriate for tracking the number of defects found in a fixed-size sample?
Answer: c-chart
The c-chart (count chart) is used when counting the number of defects (nonconformities) per unit when the sample size is constant. The p-chart tracks the proportion defective, while X-bar/R and I-MR charts are used for continuous measurement data.
In Statistical Process Control, a process is said to exhibit 'common cause variation' when:
Answer: The process shows consistent, random variation within control limits with no non-random patterns
Common cause variation is the natural, inherent variability in a stable process — data points fluctuate randomly within the control limits. Special cause variation, by contrast, produces non-random patterns such as runs, trends, or points outside control limits.
Mistake-proofing (poka-yoke) is most accurately described as:
Answer: Redesigning the process or equipment so that errors are physically impossible or immediately detected and flagged
Poka-yoke devices or design changes prevent errors at the source by making incorrect actions impossible (prevention) or by immediately signaling when an error occurs (detection). It is a stronger control mechanism than training or inspection alone.
When a control chart signals an out-of-control condition, what should the process operator do first?
Answer: Follow the pre-defined reaction plan documented in the Control Plan
A reaction (or response) plan is established during the Control phase precisely for this scenario. It tells operators the immediate containment steps to take when an out-of-control signal appears, ensuring a fast, consistent response without waiting for management or starting a lengthy analysis.
Which sustainment tool provides a visual, at-a-glance view of key process metrics and their current performance status, allowing teams to quickly identify when results are drifting from targets?
Answer: Performance dashboard or scorecard
A performance dashboard or scorecard consolidates the most important process metrics into a single visual display, often using color coding (e.g., green/yellow/red) to signal whether each metric is on target. This enables rapid detection of deterioration so corrective action can be taken before gains are lost.