AIMSSEC presented their 28th Mathematical Thinking Course to 61 in-service mathematics teachers from 3 to 12 January 2018 at Stellenbosch High School. The teachers came from three provinces: the Eastern Cape, KwaZulu-Natal and Limpopo. Four overseas lecturers assisted the local team to present the course and three AIMSSEC alumni assisted as teaching assistants, while two AIMS alumni assisted in the computer labs.