They describe it as ...This is a working document to collect information and resources for non-curricular tasks. As defined in Peter Liljedahl's Building Thinking Classrooms in Mathematics book, non-curricular tasks are clearly mathematical in nature, but do not map well to specific outcomes or standards specified in the curriculum. These tasks should be highly engaging, rich problem-solving, non-routine tasks. These tasks are used to "prime the class" and set the stage for building a thinking classroom. Then, the class will be ready to move on to curricular thinking tasks.