What makes a good title?

re:publica is big and your title will be vying for visitors’ attention alongside many with many programme points. The more direct and explanatory your title, the better. "All you need is love: Social media strategies against online hate" is better than "Why All You Need is Love". Precise wording is also important. For example: "How surgeons practise difficult operations in virtual reality" is better than "Virtual reality as a training tool".