This chapter serves only to clear any doubts that readers have about the classifications of the system attributes.
They are classified as follows;
E – D – C – B – A – S – SS – SSS – SR – SRR – SRRR – X – XR – XRR – XRRR – UR – URR – URRR – MR – MRR – MRRR – Z – ZZ – ZZZ