The ACLC-team congratulates Lani with this fantastic achievement. 

Abstract: 

This dissertation works towards an integrative theory of language aptitude, exploring how multiple learner characteristics jointly influence second language learning. Drawing on Snow’s theory of aptitude complexes, this research conceptualizes language aptitude as a system of interacting components from across cognitive, affective, and conative domains. The first part of this dissertation examines network analysis as a methodological tool. Chapter 2 shows that network analysis can reveal complex relationships in cross-sectional data, highlighting variable importance and interactions without predefined predictors and outcomes. Chapter 3 extends network analysis to time-series data from a 32-week Dutch course, demonstrating how learner states (e.g., anxiety, motivation, and engagement) evolve over time and interact differently within and between individuals.

You can find Lani's dissertation in the UvA Dare database.