In order to formulate policy and monitor implementation of legislation as regards customs, the Commission is requested to assess the impact of the current and potential policy instruments. This call for tenders aims to examine topics related to current EU and Member States' customs policies and their implementation as well as to new policy proposals and to customs issues on national, European and international levels. The economic analysis would involve a modelling framework based on reliable economic data and supported by studies and comparative analysis in various customs areas. The topics of the economic analyses will be set in a perspective of, inter alia, the smooth functioning of the internal market and the customs union, the reduction of the administrative burden as well as the objectives of the Europe 2020 strategy.