16 marks questions AQA

Hi, I was just wondering if you always put evaluation into answers for 16 mark questions? Most of them are phrased "outline and evaluate" and so obviously you evaluate, but what do you do when it just says "Discuss" eg "Discuss localisation of function in the human brain"? Do you just do a really in depth discussion or do they just expect that you will evaluate in a 16 mark answer?