The courses are brought to the schools as preinstalled apps on physical devices - the education of the teachers runs "offline". But how can you transfer the progress data of a teacher back into our online world to make it possible to react to potential problems? How can you use one handheld for teaching multiple teachers and still ensure that the quizz results stay confidential and are associated with the correct teacher? How can you find room for improvements of the courses? And how can you motivate teachers to stick with it and continue with the next module?
Although access to the Internet is not a given in rural Zambia, you can always find a GSM-capable mobile phone. Thus, the transfer of progress data is done via text messages.