The Nomological Network. What Is the Nomological Net? l An idea developed by Cronbach, L. and Meehl,...

The Nomological NetworkThe Nomological NetworkThe Nomological NetworkThe Nomological Network

What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?

An idea developed by Cronbach, L. and An idea developed by Cronbach, L. and Meehl, P. (1955). Construct Validity in Meehl, P. (1955). Construct Validity in Psychological Tests, Psychological Tests, Psychological Psychological BulletinBulletin, 52, 4, 281-302., 52, 4, 281-302.

Nomological is derived from Greek and Nomological is derived from Greek and means “lawful”.means “lawful”.

Links interrelated theoretical ideas with Links interrelated theoretical ideas with empirical evidence.empirical evidence.

What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?A representation

What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?A representation of the concepts (constructs) of

interest in a study,

ConstructConstruct

ConstructConstruct ConstructConstruct

What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?What Is the Nomological Net?A representation of the concepts (constructs) of

interest in a study,

ConstructConstruct

ObsObs ObsObsObsObs ObsObs

ObsObs ObsObs

ConstructConstruct

...their observable manifestations,

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

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

constructconstruct

ObsObs ObsObs

constructconstruct

constructconstruct constructconstruct

ConstructConstruct

ObsObs ObsObs

ConstructConstruct

Theoretical Level: Concepts, IdeasTheoretical Level: Concepts, Ideas

ConstructConstruct

ObsObs ObsObs

ConstructConstruct

Theoretical Level: Concepts, IdeasTheoretical Level: Concepts, Ideas

Observed Level: Measures, ProgramsObserved Level: Measures, Programs

PrinciplesPrinciplesPrinciplesPrinciples

ObsObs ObsObs ObsObs ObsObs ObsObs ObsObs

ConstructConstruct ConstructConstruct ConstructConstruct

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

This interlocking system of laws is the Nomological Network.

The laws in a nomological network may relate...The laws in a nomological network may relate...

observable properties or quantities to each other.

different theoretical constructs to each other.

theoretical constructs to observables.

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

ObsObs ObsObs ObsObs ObsObs

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

ObsObs ObsObs

or of increasing the definiteness of its components.

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

ObsObs ObsObs

The basic rule for adding a new construct or relation to a theory is that it must generate laws

(nomologicals) confirmed by observation...

ObsObs ObsObs

ConstructConstruct

The basic rule for adding a new construct or relation to a theory is that it must generate laws

(nomologicals) confirmed by observation...

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

ObsObs ObsObs

ConstructConstruct

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

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

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

The Main Problem with the The Main Problem with the Nomological NetNomological Net

It doesn't tell us how we can assess the construct

validity in a study.

The Nomological Network. What Is the Nomological Net? l An idea developed by Cronbach, L. and Meehl,...

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