<p>What is terrorism? </p><p>Without doubt, it is a pejorative term; few people would ever want to be called a terrorist, and when the word terrorism is attached to a belief system, it delegitimises it in the eyes of the public.</p><p>It's an emotive word with severe consequences for any individual or group given the label. Virtually everybody agrees that being a terrorist is not a good thing and that the law must seriously punish them.</p><p>But there isn't an agreed international definition of what terrorism is.</p><p>The UK has a legal definition, but it differs from other western democracies. When does property damage become a terror offence? How do police officers decide the difference between support for a cause and membership of a proscribed organisation? Should individuals without an ideology who plan or commit mass murders be considered terrorists? Are UK anti-terror laws too broad, or too narrow? And can violence by states be counted as terrorism?</p><p>Presenter: Ben Ansell Producer: Ravi Naik Editor: Lisa Baxter </p><p>Contributors: José Ángel Gascón, Professor of Argumentation in the Department of Philosophy at the University of Murcia Jonathan Hall KC, UK Independent Reviewer of Terrorism Legislation Nick Aldworth, Threat, risk &amp; security strategist, former Detective Chief Superintendent and National Coordinator in Counter Terrorism Policing. Leonie Jackson, Assistant Professor and Senior Lecturer in International Relations, Northumbria University, and author of " What is Counterterrorism For?" Richard English, Professor of Politics at Queen's University Belfast, and author of Does Counter-Terrorism Work? Rethink is a BBC co-production with the Open University</p>