With each new in-depth level, these groups are divided into more detailed subgroups of performances that can be described in more detail.
Deeper levels of properties imply more experience and skills that a person must have in order to understand which nuances of car behavior and which design features affect properties.
From the first to the fourth levels, there are properties that can be estimated subjectively. At deeper levels, there are properties that require measuring instruments to evaluate – from primitive ones: rulers, dynamometers, noise meters to more complex ones: multi-channel data acquisition systems with integrated specialized software.
For clarification, we can consider the division of the group from the first subjective level to the fifth objective level.