1.   Keyfitz uses world fisheries to illustrate the problem of communication.

2.   We will illustrate the problem using a number of summary measures of the state of the firm typically used by analysts.

3.   The following example illustrates the problem.

4.   The following example illustrates the problems involved here.

5.   To illustrate the problem consider the following case.

6.   The following diagram illustrates the problem.

7.   An episode at one Canadian plant illustrates the problems.