Suzanne Kobasa

Who they are

The 1979 study compared two groups of middle and upper level executives who had experienced comparably high levels of stressful life events, one group that had stayed well and one that had become ill. What distinguished them, on Kobasa's account, was a personality style she called hardiness and characterised by the three Cs: commitment, a sense of involvement rather than alienation; control, a sense that one's actions matter; and challenge, treating change as ordinary rather than threatening.

The objection is old, and it is about discriminant validity rather than about the data. Hardiness overlaps heavily with low neuroticism, and if the scale is largely measuring emotional stability under a new name, then the famous health finding is a neuroticism finding relabelled. That is the jingle-jangle fallacy: two names for one thing, counted as two.

A measurement problem compounds it. In this literature the predictor and the outcome are typically self-reported by the same person at the same time, and a person low in negative affectivity will report both fewer stressors and better health. The association can then appear without anything causal running between them.

Both sides, kept. The three-C structure is intuitive, the measures exist, and an association between hardiness scores and health under stress has been reported repeatedly across four decades. Against that, nobody has convincingly shown that hardiness adds anything to conscientiousness and neuroticism once both are in the regression. This site agrees with the incremental-validity critics. The underlying observation is not in dispute and survives the argument entirely: people differ substantially in what a given stressor costs them.

A note on fairness to her. The 1979 paper was a serious piece of work on a real question, and it was not making the claims the later commercial hardiness literature made. The construct's problems are mostly downstream of it. It is also worth recording that the secondary source through which this vault met the construct names neither her nor any study, sample, year or effect size, and that the identification of Kobasa as its originator is this site's own.

Key papers

Kobasa, S. C. (1979). "Stressful life events, personality, and health: an inquiry into hardiness." Journal of Personality and Social Psychology. The originating paper, conducted at the University of Chicago. Two groups of middle and upper level executives with comparably high levels of stressful life events, one that stayed well and one that became ill. The three Cs of commitment, control and challenge.

Volume and page numbers are not recorded in the vault and are not supplied here. The discriminant-validity critique has been made repeatedly since not long after the construct was proposed; the vault records the objection without individual citations, so none is given.

Key ideas

Hardiness, characterised by commitment, control and challenge. The three Cs are the construct.

The discriminant-validity objection. Hardiness overlaps heavily with low neuroticism, and if the scale is measuring emotional stability under a new name then the health finding is a neuroticism finding relabelled.

The self-report problem compounds it. Predictor and outcome come from the same person at the same sitting, and low negative affectivity produces both fewer reported stressors and better reported health.

Incremental validity is the test that matters, and it is the one the construct has not passed. Does hardiness add anything once conscientiousness and neuroticism are in the model.

The observation underneath survives. People differ substantially in what a given stressor costs them, and nothing in the critique touches that.

Be fair to the 1979 paper. It was a serious study of a real question, and the overreach is mostly downstream of it.

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