Many people, inside and outside the ROM SAF, have contributed to the development of ROPP. The principal authors are listed in below. The ROM SAF extends its sincere appreciation for their efforts. Contributing authors are: Christian Marquardt (EUMETSAT) Ex-Development Manager. Author of majority of ROPP-1 code in UTILS, IO, FM and 1DVAR modules, and much personal, pre-existing software. Huw Lewis (Met Office) 1st ROPP Development Manager, FM and 1D--VAR extensions. PP module. Dave Offiler (Met Office) ROPP Project Manager, IO application code and IO extensions, BUFR format/template. Sean Healy (ECMWF) Original 1D--Var code, FM 2D operator code. Michael Gorbunov (Russian Academy of Sciences) Original PP code. Axel von Engeln (EUMETSAT) Original Test Folder system author. Stig Syndergaard (DMI) Original spectral version of MSIS model (expansion in spherical harmonics and Chebychev polynomials), PP module developments. Ian Culverwell (Met Office) 2nd ROPP Development Manager. Documentation, testing, consolidation, IO development, GRIB2 reader, tropopause height diagnostics. Carlo Buontempo (Met Office) S-G thinner code. Michael Rennie (ECMWF) 1st ROPP Test Manager. Test folder developments. Kjartan Kinch (DMI) Elements of ropp\_pp. Hans Gleisner (DMI) Elements of ropp\_pp, prototype GRIB2 reader. Torsten Schmidt (GFZ) Guidance on tropopause height diagnostics. Chris Burrows (Met Office) 2nd ROPP Test Manager. Test folder developments. Kent Baerkgaard Lauritsen (DMI) Code reviews; liaison with EUMETSAT (licences, beta tester contracts). Any comments on the ROPP software should in the first instance be raised via the ROM SAF Helpdesk at http://www.romsaf.org