Theoretical Foundation

PREP Personality Reports are based on the assessment of four major personality traits, Controlling, Outgoing, Relaxed and Exacting, or CORE™. Items from these scales are also used to measure individuals’ Current Motivation, First Impression, Energy Reserve, Stress Level and Personal Expectations. was based on the work of personality and psychometric theorists such as Hippocrates, Carl Jung, Raymond Cattell, Alfred Adler, Gordon Allport, Hans Selye, Katherine C Briggs, Isabel Briggs-Myers, David Kiersey, Samuel Houston, among others.

PREP Personality Reports are based on the assessment of four major personality traits, Controlling, Outgoing, Relaxed and Exacting, or CORE™. Items from these scales are also used to measure individuals’ Current Motivation, First Impression, Energy Reserve, Stress Level and Personal Expectations. was based on the work of personality and psychometric theorists such as Hippocrates, Carl Jung, Raymond Cattell, Alfred Adler, Gordon Allport, Hans Selye, Katherine C Briggs, Isabel Briggs-Myers, David Kiersey, Samuel Houston, among others.

The PSP profile was then longitudinally cross-correlated with the Myers-Briggs in a sampling of adult students at Western State College in Oregon.

PREP's Original Research Studies on Validity and Reliability of the PREP Assessment

The Survey validation was conducted in 1984 and longitudinally in 1991-1992 by Dr. Samuel Houston, then Department Chair of Math and Applied Statistics at the University of Northern Colorado and JoAn Mann, MBA. The PSP was designed to bring three new elements into personality assessment:

  • Simplicity of words
  • Synthesis of the Jungian (Myers-Briggs Type Indicator) and the Hippocrates (Four Trait and Quadrant) models
  • A new long-term stress measurement that had been observed to have high correlation in test groups

The PSP profile was then longitudinally cross-correlated with the Myers-Briggs in a sampling of adult students at Western State College in Oregon.

Cross-correlations with the PDP Second edition survey were also conducted.

An analysis of internal correlations of the PSP indicates extremely high test strengths (that is, having no internal correlations) with the Problem solving style, Communications style, Exacting trait, Relaxed trait, Proactive vs. Responsive, Outgoing and Controlling traits in the Natural style. The significance level used was .0001.

The initial norming of the PSP was conducted in 1984. Over 1,000 surveys were administered to adults and teenagers aged 13 - 92.

The following represents the groups and ages surveyed:

  • 30% California
  • 15% Midwest
  • 12% Washington-Oregon
  • 10% New York
  • 10% Unknown
  • 9% Rocky Mountain Region
  • 8% South
  • 3% Michigan
  • 3% Maryland
  • 3% Florida
  • 1% Canada (BC)
  • 45% Female
  • 47% Male
  • 8% Unknown

There was a cross-section of the population in the US, with geographic areas, ethnic backgrounds, gender differences represented. 90-day test-retests were conducted for reliability measurements on 100 individuals, with a .91 reliability factor for traits remaining consistently on the same side of the norm line. (Those traits further from the norm line were more predictable than those within one standard deviation.)

Specific Research Documentation can be requested by Emailing prep.profile.systems@gmail.com