Although I'm probably a bit sad I go through the manifesto and look at all the policies and give each one a score out of 5. I then put them into categories like economy/jobs, education, healthcare, governance, sport/culture etc and these also get weighted out of 5 so things like economy, education and healthcare are given greater importance than things like arts etc.
The leader and candidate also get scores but they're actually weighted very low. I then look to see how each party scores.
Last time the LD actually came top in my analysis, which came as a slight surprise to me. I expected Greens but while they had a number of top ranked policies they also had a lot of very low scoring ones that I considered just silly which brought their score down. I was surprised because UKIP managed to outscore the Tories for me, and were only just beaten by Lab because they had so many middle scoring policies.