Every assessment instrument should meet the following features:

• Validity → Measures what it is intended to measure.

• Reliability → Produces consistent and stable results over time.

• Standardization → Administered and scored in a consistent way across individuals.

• Relevance → Aligned with the developmental area being evaluated.

• Practicality → Feasible to apply within time, resources, and context.

By Area:

• Cognitive

• Motor

• Language

• Socio-emotional

• Adaptive behavior

By Type:

• Standardized tests

• Checklists

• Observational tools

• Developmental scales

• Structured or semi-structured interviews

Example 1

• Name: Bayley Scales of Infant and Toddler Development (Bayley-III)

• Area assessed: Cognitive, language, motor, socio-emotional, and adaptive behavior

• Target population: Infants and toddlers, 1–42 months

• Description: Comprehensive developmental scale used to identify delays and strengths.

• Example of use: Applied in early stimulation programs to detect developmental delays and design individualized interventions.

Example 2

• Name: MacArthur–Bates Communicative Development Inventories (CDI)

• Area assessed: Language development

• Target population: Infants and toddlers, 8–37 months

• Description: Parent-report checklist measuring vocabulary, gestures, and early grammar.

• Example of use: Used by psychologists and educators to monitor early communication skills and support language stimulation.