A bit of vocabulary, and what I'll be doing: I will use the term 'simulator' to describe the piece of software that is to be written, and 'simulation' or the phrases 'simulation exercise' or 'running simulation' to describe the activity of using the simulator to simulate something. The foremost of my self-assigned tasks is to create a simulator, with appropriate documentation, that I hope will be capable of simulating the world economy. That does not mean it can only be used to simulate the economy of the whole world, and indeed I hope it will be used for simulating smaller units. If Ed Weick is right it may not make much sense to model the whole world, but the simulator created with that in mind could certainly be used to model any domestic economy. Whether or not Ed is right about this should be something the simulations can answer. To run a simulation you need more than the simulator, you need a collection of data in a particular format, which I will call a 'dataset'. I have also assigned myself the task of collected and formatting a dataset for use in simulating the world economy. I do not have the expertise or the manpower to do this properly, so what I produce should be called a 'demonstration dataset' and I intend to use it in convincing people to work on this project and supply better data. It is my intention to do the systems engineering for this project properly, but as well as all the documentation that implies I want to produce a prototype or proof of concept. The prototype will lack many of the capabilities I've written about, but it should be capable of loading the demonstration dataset and running some kind of simulation with it. After I have produced requirements and design documentation and a crude working prototype the task of properly implementing the simulator can begin, and for that I'd like to get some help. In the meanwhile I'm comfortable working alone, though I'd certainly not turn down help if someone is anxious to provide it. dpw Douglas P. Wilson [EMAIL PROTECTED] http://www.island.net/~dpwilson/index.html