Smart grids, next-generation mobile networks and digital studio broadcasting all need accurate and stable synchronization for reliable and optimized operations. To ensure synchronization is kept within the expected accuracy levels, in-service monitoring and assurance is key. In his talk WSTS talk, Nir Laufer discussed solutions and best practice to enable affordable in-service synchronization monitoring. He reviewed use cases in telecoms, power utilities and broadcasting networks and demonstrated how to achieve full visibility of the synchronization network.