Rather than contradicting the established view that barriers to services trade are important, this highlights the problem of collecting accurate data on such barriers. Data on services flows have only recently become available but they are still limited. Barriers to services trade are wide ranging and reflect the heterogeneous nature of services products. Compiling and categorising restrictions is difficult and their quantification even more so, but progress needs to be made in this area for the effects of restrictions to be properly understood. This issue has wider implications. With the share of services in world trade increasing, it becomes ever more important to be able to accurately model services trade and estimate the impact of changes in restrictions on trade flows.