The document analyzes the effect of managerial changes on team performance in several top European football leagues. It finds that home team performance improved significantly in all leagues except Serie A after a new manager was appointed. Away performances gradually improved over two months in the Premier League, Bundesliga and Serie A, but saw no change in La Liga. Overall, all leagues saw performance increase with a new manager, with average points per game more than doubling to 1.214 in the first 30 days.