I. Interactive input
All the information required in this model is supplied through different questions asked by GREENPLAN

Number of processes  
Number of chemicals  
Number of markets  
Interest rate  
Project life time Years
Main product for each process  
Toxicity index for each chemical (LD/50) GR/KD
Min and max capacities of processes KTON/ year
Mass balance coefficient  
Variable investment coefficient $/Ton-year
Fixed investment coefficient $/yr
Operating expenses per unit of main product $/ TON
Cost for purchase of one unit of chemical $/TON
Purchase lower and upper bound TON/yr
Sales lower and upper bounds TON/yr
*Positive sign for inputs, negative sign for outputs