1. L. BastidasB. Nijssen, H. GuptaW. EmmerichE. Small

2. L. BastidasB. Nijssen, H. GuptaW. EmmerichE. Small Big Delay ! l There is a big delay – 1 year l Cause: :Additional quality control of data was required :Very little participation from the community l Lately things have warmed up (last 2 months) :Several groups have submitted results of step 1 :Several groups have contacted us indicating they are currently working on the experiment l A new timeline has been proposed :Submitted for approval to the GLASS meeting in Japan :If no additional participation will go ahead with the 9 models already working.

3. L. BastidasB. Nijssen, H. GuptaW. EmmerichE. Small Submitted so far – STEP 1 only 1. SPONSOR – Institute of Geography, Russian Academy 2. SWAP – Institute of Water Problems, Russian Academy 3. SEWAB – GKSS Research Center, Germany 4. CBM – CSIRO, Australia Soon to be submitted 5. MOSAIC - NASA Goddard, USA 6. SSib – COLA, USA 7. VIC – U of Arizona, USA 8. BATS – UCLA, USA 9. Sib2 – USU, USA

4. L. BastidasB. Nijssen, H. GuptaW. EmmerichE. Small Other Modeling Groups l Additional groups that have expressed interest: :Noah – NOAA USA :ORCHIDEE – France :MOSES – Met Office UK :SSib – UCLA USA :CLASS - Canada

5. L. BastidasB. Nijssen, H. GuptaW. EmmerichE. Small Updated Timeline February 2004, Submission of final experimental protocol March 15 th,2004, Submission of model information and default parameter sets used by the models for semi-arid areas March 15 th, 2004, Distribution of forcing data to the participants through the website www.sahra.arizona.edu/pilpssanpedro October 31 st, 2004, Submission of default parameter simulations STEP 1 November 1 st, 2004, Distribution of calibration data for STEP 2 and STEP 3 November 30 th, 2004, Submission of results from STEP 2 – ad hoc calibrations January 31 st, 2004, Submission of results from STEP 3 – automatic calibrations February 1 st, 2005, Distribution of data for STEP 4 February 28 th, 2005 June 15, 2004, Submission of results from STEP 4 March 31 st, 2005 June 30th, 2004, Submission of results from STEP 5 April 1 st, 2005 July 1st, 2004, Distribution of data for STEP 6 April 30 th, 2005 July 30th, 2004, Submission of results from STEP 6 August/September 2005, Workshop for analysis of preliminary results, at Utah State University. January, 2006, AMS session for final analysis and presentation of results