Tags are what WordPress calls keywords. I attach a small number of tags to every post to help people navigate between content with the same keywords. Tags may be people (Robert Buckland, say), organisations (The Howard League, Revolving Doors Agency), themes (women offenders, homelessness) or specific items (heroin, cocaine, ROTL). If you’re looking to research a particular issue, they can be invaluable.
A Crime Harm Index is a low-cost, easily adoptable barometer of the total impact of harm from crimes committed by other citizens, as reported by witnesses and victims.