1) Open the world.xls or other input files in C:\ PELPS\GFPM directory to make changes, then save them with the Excel save function. Invoke the PELPS menu by clicking the C:\PELPS\GFPM\GFPM.BAT icon or a GFPM shortcut. Choose option 1 and the input.xls file will be loaded automatically.
2) Click the appropriate button(s) in the Save Input Menu to prepare the input files. The run-time parameters may also be adjusted at this point by choosing option 2. Otherwise options 3 or 4 (solving the base-year only or producing projections) can be selected.
3) The user would observe the model while it runs to make sure there are no run-time errors, bad rows, or other problems. LINDO displays a message referring to poor scaling, which has to do with the relative magnitudes of the largest and smallest values in the model; the resulting inaccuracies are acceptable.
4) After completing stage 3 above choose option 5 to prompt the Get Output Menu. Click the appropriate button to retrieve the results (see the instruction in the spreadsheet). The macro will automatically generate charts and graphs of the results in several files, each labelled according to its contents: production, consumption, prices, imports, exports, net trade, and capacity. Be sure to save these under different names or copy the whole directory before using the Get Output Menu again, to avoid overwriting results of old models. The detailed tables by country for the whole GFPM model are stored in the "CountryTable" sheet of the C:\PELPS\GFPM\SUMMARY.XLS file.
5) When running the WORLD model and a regional model, it is necessary to follow all the above steps twice: first run the WORLD model, then link the WORLD model and the regional model before running it (see the instruction in the Get Output Menu).
6) The final stage is to quit PELPS III by choosing option 6.