A systematic approach to the training of graduate teaching assistants (GTAs) is required to meet the challenges posed by growing numbers of undergraduate and graduate students. At University College Dublin, educational developers and academic staff across six schools collaborated on the design and phased implementation of context-specific GTA modules. By year three of the project, academics were successfully implementing credit-bearing GTA modules in their schools, describing them as tailored and relevant to their needs, and valuing the dynamic partnership involved in their development. GTAs stated that the modules helped them to understand relevant policies and procedures, motivated them to fulfil their role, and had given them ideas on ho...