First, I'd like to thank the forum owner (or owners) for a great forum and resource. I recently found Typologycentral when searching for the relationship between insecurity and Type.
I've been interested in and studied MBTI for about 30 years, every since I was first introduced to MBTI by a friend.
Some years ago I stumbled across this... Associating the qualities of Subjective ("S") or Objective ("O") with each of the sixteeen MBTI temperament categories helps me more easily understand behavior. For example:
E=O (Prefer being around people)
I=S (Prefer being by myself)
S=O (Aware of immediate environment)
N=S (Often in dreamland)
T=O (Decisions made objectively)
F=S (Decisions made subjectively)
J=O (Do what "should be" done)
P=S (Do what I feel like)
An "extreme" Temperament Type example may help the associations make sense. Take an INFP for example. Written with S's and O's, they're all Subjective: SSSS. With all mental and behavioral qualities subjective in nature, it's easy to understand why it's tough for them to live in a world run by Extroverts.
A slightly looser but similar relationship exists between Subjectivity and Objectivity and the 4 MBTI categories. The mental qualities - S,N,T,F - are more subjective in nature than the more outwardly oriented behavior qualities -E,I,J,P.
Writing the Types with S's and O's, it also helps me more quickly grasp a Type's tendencies by slightly rearranging the order of the four letter designations. Putting both mental qualities (S/N_T/F) first and the the two behavioral qualities (E/I_J/P) last, visually (formatting-wise), makes sense to me.
Considering the above, and re-writing an ENFJ with S/O's: SSOO (SN/SF/OE/OJ), makes the intuitive, feeling, outgoing, responsible planner's Temperament more obvious at a glance.
Make sense, thoughts?