Two major scales used to assess infant temperament and a common challenge?

• A. IBQ and TBAQ; challenge: context-dependency and reporter bias
• B. MMPI and WAIS
• C. Bayley scales
• D. ETCH

Answer: (A)

Measuring infant temperament relies heavily on caregiver-reported questionnaires like the Infant Behavior Questionnaire (IBQ) and the Toddler Behavior Assessment Questionnaire (TBAQ). These tools were developed specifically to capture early temperament across infancy and toddlerhood, focusing on dimensions such as reactivity, positive affect/surgency, fear/distress, and effortful control as observed in everyday situations. Their prominence comes from widespread use in research and their ability to cover multiple temperament domains over time, making them the go-to instruments for this age range.

A key challenge with these scales is context-dependency: a child’s behavior can vary across settings and situations, so ratings may reflect where the child was observed rather than a stable trait. Reporter bias is another issue—parents’ moods, stress levels, cultural expectations, or desires to present their child in a certain way can color their ratings. These factors can introduce measurement error and affect consistency across studies or time points, which researchers address by using multiple assessment methods (including observational tools) and by gathering data across diverse contexts.

In this field, the other options don’t fit because they aren’t designed to assess temperament in infancy: some are adult personality or cognitive tests, and others target developmental milestones rather than temperament traits.