The Task Force on Integrated Assessment Modelling under the United Nations Economic Commission for Europe (UNECE) Convention on Long-Range Transboundary Air Pollution holds its 41st Meeting in Bilthoven/NL from 7-9 May, 2012. Stefan Reis (CEH) is presenting an overview of LIAISE, with a focus on the toolbox development, at this meeting, which serves to share experiences and discusses latest developments in integrated assessment modelling on national and European scale.