The following essay wants to remind international researchers of the 1st of June, 1911 - the date at which questionnaires for each and every educational institution in all the German colonies around the world had to be completed by the relevant governmental or missionary authorities responsible for them. The numerous questions touched upon quantitative and qualitative data such as enrolment data, numbers and status of teachers, school compound and classrooms, school attendance, curricula and syllabus, learning achievements, teachers\u27 attitudes towards the abilities and motivation of the \u27native\u27 children and youths and other variables. This large data collection was conducted under the auspices of the Hamburgisches Kolonialinstitut...