Reliability → produces consistent and stable results.

Standardization → has uniform rules and procedures for application.

Relevance → useful for the area of ​​development or skill being studied.

Sensitivity → detects small changes in the child's development.

• Cognitive (intelligence, memory, attention).

• Motor (gross and fine coordination).

• Language (comprehension, expression, communication).

• Socio-emotional (interactions, emotional regulation).

• Adaptive (daily living skills).

  
  

🔹 By type

• Standardized tests (e.g., Bayley Scales).

• Checklists (developmental checklists).

• Observation tools (behavioral records).

• Developmental scales (Denver II, Battelle).

• Interviews (structured or semi-structured with parents/caregivers).

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

• Area assessed: Cognitive, motor, language, socioemotional, and adaptive.

• Target age: 1 to 42 months.

• Description: Comprehensively assesses early development in different areas.

• Example in early stimulation: Allows identification of language or motor delays to design an intervention plan.

• Instrument Name: Battelle Developmental Inventory (BDI-2)

• Area Assessed: Communication, motor skills, cognition, adaptation, and socialization.

• Target Age: 0 to 7 years.

• Description: Combines observation, interviews, and structured tests to assess child development.

• Example in child psychology: Detects special educational needs and guides early intervention programs.