4.1 The Set-up

4.1.4 Runs of the model

Figure 8. Variations in the 8 runs of the model

Four of the runs were done with the friendly scheme of expression evaluation and four with the crowd-avoiding scheme. In each of these clusters of four runs, in two of the runs the evaluation of saidBy and saidByLast primitives was made the same as an evaluation of a randomDecision terminal, regardless of what was actually said by the relevant agent. This had the effect of stopping agents from `listening' to what each other said. In each pair of runs one run was with the imitation mechanism on and one was with this mechanism set as off.

In this way the eight runs cover all the combinations of: friendly/crowd-avoiding utility schemes; imitation/no imitation; listening and not listening, these possibilities are illustrated in figure 8. To ease reference to these runs I have given each a mnemonic - this is composed of two letters to indicate the utility scheme (ca for `crowd-avoiding' and fr for `friendly'), followed by some letters to indicate whether imitation and/or listening were enabled. For example the mnemonic for the 4th run is ca+li, because the crowd-avoiding utility scheme was used and both listening and imitation were enabled.

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