elements of a control chart

1. What are the Elements of a control Chart?
There are four main elements of a control chart.
1. Horizontal or X-Axis. This axis displays the chronological
order
2. Vertical or Y-Axis. This axis reflects the magnitude of the
data collected.
3. A central line (X) is added as a visual reference for detecting
shifts or trends – this is also referred to as the process
location.
4. Upper and lower control limits (UCL and LCL) are
computed from available data and placed equidistant from
the central line. This is also referred to as process
dispersion.
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2. If all process values are plotted within the upper and lower
control limits and no particular tendency is noted, the process is
referred to as "In Control." If the process values are plotted
outside the control limits or show a particular tendency,
however, the process is referred to as "Out Of Control".