This is the start of a four-part blog on control charts. The blogs will answer the following questions:
- What is a control chart?
- What is variation and how does it relate to a control chart?
- What is a control chart used for?
- Where is a control chart used?
Control charts are at the heart of statistical process control (SPC). So maybe we should start with answering what a process is. A process is simply what we do. It can be filling out an expense report, checking a person into a hospital, driving to work, filling a prescription, etc...