Dr. Grant is creating a new measure of shyness, and she decides to include more than one item in her scale. She believes that using multiple items will lead to a more reliable measure. Dr. Grant is following which principle of measurement?

A) multitrait assessment
B) content validation
C) aggregation
D) construct validation

Shyness

A temperament or personality condition characterized by a feeling of unease or inhibition in social situations, possibly leading to avoidance.

Measurement Principle

The fundamental concept that any phenomenon to be studied must have a corresponding method of measurement to be scientifically investigated.

Aggregation

The combining together of different measurements, such as by averaging them.