Six Sigma Green Belt Certification Practice Exam

Short-term capability focuses on the process's performance over a relatively brief period and typically involves smaller sample sizes that capture immediate variations due to specific, often uncontrollable, factors. This means that control limits—representing the acceptable range of variation for process performance—are more concentrated when assessing short-term data. When evaluating short-term capabilities, the control limits are constructed based on normal variations in a stable process. Consequently, because the sample size used for short-term evaluations is limited and reflects only a momentary snapshot of the process, the control limits will naturally be closer together. This enables a more accurate representation of how the process performs under stable short-term conditions, which is essential for identifying any immediate issues or improvements without the potential noise introduced by longer-term data. In contrast, long-term evaluations incorporate a broader range of data over time, including variations from external factors or shifts in performance that might not be present in short-term assessments. This generally results in wider control limits due to the increased variability observed over more extended periods. Thus, the focus on tighter control limits for short-term evaluations is a principle aspect of measuring process capability, making that statement true.