Ability to solve problems, including abilities to categorize, sequence, pay attention, recognize relationships between numbers and relationships between parts and whole, and of executive functioning.

Development of expressive and receptive language. Expressive language relates to the childrens ability of articulate words and concepts. Receptive language relates to a childrens comprehension of language.

Recognizing and learning to deal with emotions, along with the development of self-esteem, autonomy, and social skills.

Fine motor skills (scribbling, drawing or writing, picking and holding objects up), gross motor skills (crawling, walking, running, jumping) and coordination.

• Preliminary interview
• Informed consent
• Household registry
• Form "A" of the Engle Scale to evaluate Child Development and Height-for-Age
• Form "B" of the Engle Scale to evaluate Child Development. Peabody Picture Test and Height-for-Age
• Survey of the Child and Home
• Answer cards for the Survey

• Sampling Guide
• Manual for the adaptation of PRIDI's instrumentation
• Manual for the training of enumerators
• Training of enumerators (in slides)
• Instruction manual to apply Forms "A" and "B" of the Engle Scale to evaluate Child Development
• Manual for evaluations and preliminary procedures (procedures to be followed by the enumerator during collection of data)
• Indications to complete the National Adaptations Forms

Immutable characteristics of the child: Birth date, sex, maternal language, birth-order.

Socio-economic status of the home, presence of both parents in home, maternal language and education level of parents, access to basic services in the home, number of siblings, parental interaction with child, language-rich activities in the home, child rearing strategies, basic health information.

Urban or rural, distance from health post or hospital, availability of basic services.

Participation and duration of child in such programs. Included here are ECD, early education, nutrition, and conditional cash transfers.