A critical aspect of inclusive policies and practices is the role that Teacher Assistants (TAs) are supposed to assume within mainstream classrooms. Despite the evidence, TAs are still linked to the most vulnerable children, especially those with severe afflictions. This exploratory mixed method of investigation analyses the differences between the job requirements standardised by the Catalan Government (Spain), the roles the TAs believed they had been hired to perform and the tasks they were really carrying out in their schools.