Dreyer Lötter and Liezel Blom started SATeacher in 2003, focusing on teachers' professional development in South Africa. Through the development of teachers, the need arose to develop structured teaching plans and resources based on the South African curriculum. To date, SATeacher developed and published hundreds of titles, and the materials are used in every school in South Africa. Dreyer Lötter and Liezel Blom also founded Cytocento which was appointed by the Gauteng Educational Trust as part of the GPLMS Project with 225 schools and almost 900 teachers in 2013. The Gauteng Educational Trust also appointed Cytocento to develop the Mathematic lesson plans for the GPLMS project for both the Foundation and Intermediate phases for 2012 and 2013. SATeacher is also involved in developing resource packs for the Robben Island Museum and PAMSA (Paper Manufacturers Association of South Africa) in line with the National Curriculum (CAPS), similar to the resource pack we developed for Maropeng – Cradle of Humankind. The Ministry of Education appoints Liezel Blom, Dreyer Lötter and Deirdre Hilton to develop the Mathematics DBE Learner Books. They are involved in the writing of the Grade 1, 2, 3, 4, 5, 6, 7, 8 and 9 Mathematics Learner Books and Teacher Guides and aligning the Grade 1 and 9 Learner Books with the CAPS. All the teacher content is developed from scratch for the South-African market.