The ability to reuse content at a modular level so that when changes happen, not every page needs to be changed, just the reused content. You can take it further by suggesting content for reuse. Paligo does this. As you type an instruction, it tells you that a similar instruction already exists - do you want to reuse...? This can be done at a sub task level or at a step level. The entire content unit including the screen shot for the step - can be reused.