Abstract
The present study represents a contribution to the assessment of infant cognitive development by presenting a valid instrument for observing the development of logical reasoning and executive function during the second year of life-key processes in the construction of human knowledge. The instrument constructed, called ELEDA (Early Logical and Executive Development Assessment), was a combined or mixed observation instrument composed of field formats and category systems. Its validity was calculated using generalizability theory, which enables different sources of error affecting a behavioral measurement to be analyzed jointly. The need for valid early cognitive assessment instruments such as the one in the present article is evident, since the sooner assessment is performed, the sooner action can be taken, thus optimizing the results.
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