However, in most cases the exchange of information and ideas on a given topic, and making more transparent to industry the range of practices we see in a rapidly developing area, may be the most important outcomes. IV. Concluding thoughts  I would like to conclude by summarising the main themes of my talk.
Although the exact number of children for a given couple is not known for sure, the average rate of birth per couple becomes largely predictable. The popular perception that demographic change is in general predictable is based on this law of large numbers.