Most jobs will state if they want you to address KSC in which case I would do so by putting the KSC in bold and then answering the criteria by giving examples of what I have done that covers it if that makes sense. Will find a thread I started a while back which people had some great advice - in teaching there are 5-7 criteria and each is one page long so I had no idea - most people said 1 to 2 paragraphs is plenty.