Which of the following is NOT typically a problem associated with control charts?

In the context of control charts, the characteristic that stands out as not typically a problem is the ease of interpreting results. Control charts are designed to be straightforward visual tools that display process data over time, allowing users to quickly assess whether a process is in control or has shifted outside of acceptable limits. This visual representation, combined with established rules for interpretation, facilitates prompt understanding and decision-making.

In contrast, the other options relate to genuine challenges that can arise with the use of control charts. For example, complex mathematical calculations might be necessary for setting up the charts and interpreting them accurately, which can be a barrier for some users. Additionally, control charts can sometimes convey misleading information if used incorrectly or if the underlying data is not appropriate, leading to misinterpretation of process stability. Similarly, if the frequency of sampling is not suitable for the variability of the process being monitored, the insights derived from the control charts can be flawed, resulting in ineffective or misguided actions.