When Skien introduced developmental learning in math, it drew on experiences and work already done in Sandnes, for example, by reusing textbooks. After initially testing the methodology in a few classes and achieving promising results, Skien expanded the methodology to other classes and schools. Positive evaluations by teachers and improved math scores in the test classes helped in spreading the methodology widely to other schools. At present, academic results in math have generally improved, with some schools in Skien performing among the region's best in math. Inspired by the results so far, Skien has set a goal for 90% of students to complete high school within the prescribed amount of time by 2023.