In this scenario, an apparently simple objective creates several dilemmas for educators who seek to achieve it. What will it mean to specific children to be involved or not? What will they learn from your reactions in a range of situations? Adherents of a practical approach to curriculum argue that such dilemmas are part of normal teaching day and demonstrate that curriculum is complex process which understandings of children's behaviours is at the heart of what you say and do and don't say and do This complexity led Stenhouse to raise the following question about the content and development of curriculum goals: "Can there be principles for the selection of content other than the principle that it should contribute to the achievement of an objective?" Joseph Schwab, in the US, attempted to answer those questions especially, in his 970 paper: The Practical A Language for the Curriculum. Carr and Kemmis describe it as follow