Indeed, the model needs to be extended to take account of differences between individuals in wealth.

Most models taken on someone's books will need a professional portfolio of themselves.

The model now needs to be tested in other emergency situations.

Traditional models of 'leading the service' may need to be broken.

The above model needs to be modified using the current measurement.

A model or document needs to be sufficient for the situation at hand and no more.

The European social model also needs to be reviewed constantly.

Therefore our social model needs to come to terms with the new reality.

If the market is dominated by a few large firms, however, then economic models need focus on these.

A model need not have every last detail included to be useful or to help us learn from it.