The Australian Government is supporting the Government of Timor-Leste to undertake educational reforms through the Partnership for Human Development (PHD) and Apoiu Lideransa liuhosi Mentoria no Apredizajen (ALMA). ALMA enables the Ministry of Education, Youth and Sport (MoEYS) to develop teacher professional learning to support the implementation of its National Basic Education Curriculum. Under the Teacher Development Multi-Year Study for Timor-Leste, the Education Analytics Service (EAS) is investigating how ALMA is making a difference to teaching and learning outcomes. The new curriculum was developed in 2013 as a staged approach for pre-school to grade 6, with a focus on improving literacy and numeracy, and reducing student drop out. The Teacher Development Multi-Year Study for Timor-Leste seeks to answer the question: To what extent does this aid investment produce improved teaching quality and improved student learning? This brief report presents highlights from the study's findings.