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The Nomological Network. What Is the Nomological Net?. An idea developed by Cronbach, L. and Meehl, P. (1955). Construct Validity in Psychological Tests, Psychological Bulletin , 52, 4, 281-302. Nomological is derived from Greek and means “lawful”.

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what is the nomological net
What Is the Nomological Net?
  • An idea developed by Cronbach, L. and Meehl, P. (1955). Construct Validity in Psychological Tests, Psychological Bulletin, 52, 4, 281-302.
  • Nomological is derived from Greek and means “lawful”.
  • Links interrelated theoretical ideas with empirical evidence.
what is the nomological net2
What Is the Nomological Net?

A representation of the concepts (constructs) of interest in a study,

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What Is the Nomological Net?

A representation of the concepts (constructs) of interest in a study,

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...their observable manifestations,

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What Is the Nomological Net?

A representation of the concepts (constructs) of interest in a study,

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...their observable manifestations, and the interrelationships among and among these.

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What Is the Nomological Net?

Theoretical Level: Concepts, Ideas

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What Is the Nomological Net?

Theoretical Level: Concepts, Ideas

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Observed Level: Measures, Programs

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Scientifically, to make clear what something is means to set forth the laws in which it occurs.

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This interlocking system of laws is the Nomological Network.

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The laws in a nomological network may relate...

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observable properties or quantities to each other.

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The laws in a nomological network may relate...

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different theoretical constructs to each other.

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The laws in a nomological network may relate...

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theoretical constructs to observables.

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At least some of the laws in the network must involve observables.

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"Learning more about" a theoretical construct is a matter of elaborating the nomological network in which it occurs.

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"Learning more about" a theoretical construct is a matter of elaborating the nomological network in which it occurs...

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or of increasing the definiteness of its components.

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The basic rule for adding a new construct or relation to a theory is that it must generate laws (nomologicals) confirmed by observation...

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The basic rule for adding a new construct or relation to a theory is that it must generate laws (nomologicals) confirmed by observation...

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or reduce the number of nomologicals required to predict some observables.

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Operations that are qualitatively different "overlap" or "measure the same thing"...

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Operations which are qualitatively different "overlap" or "measure the same thing"...

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if their positions in the nomological net tie them to the same construct variable.

the main problem with the nomological net
The Main Problem with the Nomological Net

It doesn't tell us how we can assess the construct validity in a study.