Abstract
The central goal of the heritage language (HL) curriculum is to facilitate ultimate attainment of the language by advanced speakers. However, the field of HL studies faces a problem in how to accurately and efficiently identify and measure weaknesses and strengths of advanced HL speakers on their way to ultimate attainment. So far, only the age of arrival to the country where the dominant language is spoken has been formally investigated as the most critical factor that influences full professional proficiency and ultimate attainment of the HL. The field of HL studies needs to embrace a formal psychometric approach that will allow us to go beyond the effect of age of arrival to uncover contributions of other naturally occurring factors, i.e., genetic, physiological, cognitive, developmental and environmental. At the core of this approach lies a comprehensive standardized assessment of (a) proficiency in HL and (b) general cognitive abilities.
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