1) The first stage is to make any desired changes, to the WORLD or regional model input file and save this in the C:\PELPS\GFPM directory. The next stage is to open C:\PELPS\GFPM\INPUT.XLS and click the appropriate button(s) to prepare the input file. When the macro is finished, it automatically closes Excel.
2) Invoke the PELPS menu by clicking the C:\PELPS\GFPM\GFPM.BAT icon or a GFPM shortcut. If changes have been made to the input file since the last time the model, was run it will be necessary to run option 1 to prepare the new input file. 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 should 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, the user can quit PELPS (menu option 6). The file C:\PELPS\GFPM\OUTPUT.XLS should then be opened to get the Get Output Menu Click on 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 formatted detailed tables by country for the whole GFPM model are stored in the "CountryTable" sheet of 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 OUTPUT.XLS file).
List of Working Papers to be released
GFPOS/WP/01: Global forest products consumption, production, trade and prices: global forest products model projections to 2010
GFPOS/WP/02: The global forest products model (GFPM): users manual and guide to installation
GFPOS/WP/03: The outlook for future wood supply from forest plantations
GFPOS/WP/04: The potential for technological change to influence future wood supply and demand
GFPOS/WP/05: Past trends and future prospects for the utilisation of wood for energy
GFPOS/WP/06: The potential contribution of trees outside of forests to future wood supplies