Detailed Explanation:
The correct answer is A. Run chart with control limits.
A control chart is essentially a run chart that includes statistically determined control limits. It displays data over time and helps determine whether process variation is due to common causes or special causes.
This makes it one of the most important tools in statistical process control.
Why A is correct:
A run chart shows data in time order. A control chart adds a center line and control limits, allowing the user to evaluate process stability and identify unusual variation.
From a Quality Management Excellence perspective, control charts support evidence-based monitoring and help distinguish between normal process fluctuation and signals that require investigation. This is aligned with disciplined process management and data-based decision-making.
Why the other options are not correct:
B). Chart showing in-control processes only
A control chart is not limited to in-control processes. It is specifically used to determine whether a process is in control or out of control.
C). Histogram
A histogram shows the distribution of data, but it does not preserve time order.
D). Pareto chart
A Pareto chart is used to rank categories by frequency or impact. It is not designed to monitor process behavior over time.
Quality Management Excellence interpretation:
Use process-monitoring tools that preserve time sequence when the objective is to understand performance over time. A control chart is more informative than a basic run chart because it supports interpretation of stability, variation, and control status. Best practice is to use control charts whenever ongoing process behavior must be monitored objectively.