You are given a compressed folder Eady.zip, copy it to the place you want your project to live, right click on the file and select Extract All, then follow the instructions in the WinZip wizard. If you do not have WinZip then it needs to be downloaded and installed. It is recomended that you use a compiler with an intergrated development environment for example Salford. A free version of Salford F95 can be downloaded from: www.silverfrost.com/32/ftn95/ftn95 personal edition.asp All of the code is found in one file and can be attached to a new project inside the compiler. The fortran file and all of the Matlab files need the line below changing to the location that the output files will be placed: directory='h:\READING\Data Assimilation\Eady\data\' in the fortran the declaration of 'directory' needs to be changed to the correct length of the path string.