Language History Questionnaire
Read more about the LHQ here.
Li, P., Zhang, F., Tsai, E., Puls, B. (2013). Language history questionnaire (LHQ 2.0): A new dynamic web-based research tool. Bilingualism: Language and Cognition, DOI: 10.1017/S1366728913000606.
Some papers by collaborators on the acquisition of variation
Miller, K. (2013) Acquisition of variable rules: /s/-lenition in the speech of Chilean Spanish-speaking children and their caregivers. Language Variation and Change 25, 3, 311-340.
Miller, K. & Schmitt, C. (2012) Variable Input and the Acquisition of Plural Morphology. Language Acquisition: A Journal of Language Development 19 (3), 223-261.
Miller, K. & Schmitt, K. (2010) Effects of variable input in the acquisition of plural in two dialects of Spanish. Lingua, 120 (5) 1178-1193.
Shin, N, L. (2012). Variable use of Spanish subject pronouns by monolingual children in Mexico. In K. Geeslin & M. Díaz-Campos (eds.), Proceedings of the 2010 Hispanic Linguistics Symposium, 130-141. Cascadilla Proceedings Project.
Shin, N. L. & Erker, D. G. (2015). The emergence of structured variability in morphosyntax: Childhood acquisition of Spanish subject pronouns. In Ana M. Carvalho, Rafael Orozco & Naomi Shin (eds.), Subject Pronoun Expression in Spanish: A Cross-dialectal perspective, pp. 169-190. Washington DC: Georgetown University Press.