Presentation from the seminar for watchdog organizations "Key communication principles of watchdog organizations: what works?" organized by Citizens Network - Watchdog Poland in cooperation with Helsinki Foundation for Human Rights and the European Center for Not-for-Profit Law with support of the Swiss Agency for Development and Cooperation and Trust for Civil Society for Central and Eastern Europe along with Oživení (Czech Republic) with support of the Open Society Foundation in Prague, Warsaw, October 17 - 18, 2013. Author: Jitka Nesrstova, Greenpeace Czech Republic.