Comparing MBTI® Form G and Form M



Abstracted from CPP Currents article by Janet Bachand, Summer 1998

FORM G (1977)
Discontinued 2012
All preferences equally valuable;
Items based on Jung and Myers type theory;
Purchasing requires qualifications 		FORM M (1998)
All preferences equally valuable;
Items based on Jung and Myers type theory;
Purchasing requires qualifications
126 items;
94 scored for type;
32 research items 		93 items scored for type;
51 items from Form G unchanged;
42 items - reworded from G or new
Four-letter type Four-letter type
Scoring based on Myers' Prediction Ratio Scoring based on Item Response Theory (IRT)
Scored items weighted 0, 1, or 2 in both the computer and template scoring versions All items weighted 1 in template scoring and weighted by IRT method in computer scoring
Forced choice item format;
Choice of 2 or 3 responses 		Forced choice item format;
Choice of 2 responses
Phrase and word pair items Phrase and word pair items
Separate male and female weights Same weights for males and females
Hand-scoring with templates;
Computer scoring 		Hand-scoring with templates;
Computer scoring
Type, not trait Type, not trait
Standard MBTI® form 1977-1998;
Basic form;
Self-scorable form 		Standard MBTI® form as of August 1998;
Basic form;
Self-scorable form