I couldn't agree more that effectively displaying gratitude is linked to personal reflection. When I am conducting end of year reviews or providing feedback on performance to employees generally I always find it easy to collate a a list of faults or area's of improvement and often find myself scratching my head when it comes to detailing the positives. Reflecting on recent events is not enough either as to truly recognise someones achievements I find you need to empathise with them. Putting yourself in the other person shoes, showing understanding of their struggles and successes allows you to narrow in on not only what positive contributions they have made to the company but also what they themselves might feel proud of. Recognising these achievements will often have a greater positive impact than highlighting a company milestone.