Whenever information you want to discuss is complicated or detailed in nature, summaries of it should be provided as handouts so that your audience can look at it during your are presentation as well as take it with them to think about at a later point in time. And as we discussed earlier, graphic displays of information are preferred over tabular ones. For example, of the two presentations of data concerning the sources of infection among cases of pertussis presented here, the pie chart is much more effective than the table in readily conveying that the majority of pertussis cases have an unknown source of infection. In addition, the pie chart is much better at grabbing the attention of the reader, and lends itself to being abstracted by people such as local public health practitioners to share with members of the public, and news reporters when writing stories. Such efforts themselves further promote the communication of surveillance information with other groups.