Full System Comparisons
A Full System Comparison - not surprisingly - compares the behaviour of your entire process between two times.
It's often used to compare two particular time periods to determine the root cause of a difference in behaviour, such as a quality failure, breakdown or unusual amount of resource usage.
It works through your system asset-by-asset to determine if there were any significant differences in values or value behaviour during the time periods. For example, for analogue values it will compare the minimum, maximum and standard deviation of the values across the times. For discrete values, it will examine the number of state changes and relative time spent in each state.
It works from the root of your Location hierarchy upwards, which should hopefully catch major differences (such as process speed, product type, air supply pressure etc.) early. It will then proceed further down until it examines each selected part of your process.