Re: Balance between Cost and Quality
Basically introduce what you are going to say.
Explain what costs are, probably put a cost leadership reference in there too and how it benefits businesses. introduce the fixed and variable costs and explain how to reduce them
Explain what quality expectations are
Make a link between the two (such as when your costs are lower than they used to be the quality might degrade as well. The business needs to take into consideration the quality expectations of consumers before drastically trying to reduce their costs and assess how reducing the costs will impact the quality of their product). Depending on the question you can go to quality management and make reference to a case study on which one they use (assurance, improvement, control)
Conclude it
Link all those parts to the case study your doing. You need to find a case study to do for the hsc in the end and I'm not sure what you teacher is actually thinking not introducing one to you already. Nonetheless you can use a popular one such as Billabong or Qantas as they both have lots of information in them. With Qantas there is an actual case study book which costs $30 though it's pretty good if you want relevant dotpoint information.