They should understand what the ideas and concepts they study mean in the practice , how they can be used and have already been used .
They should understand what the ideas and concepts they study mean in practice , how they can be used and how they have already been used . They should understand what the ideas and concepts they study mean in the practice , and how they can be used and have already been used . They should understand what the ideas and concepts they study mean in practice , and how they can be used and have already been used . They should understand what the ideas and concepts they study mean in practice , and how they can be used and have already been used .