visiting cities with large, easily accessible populations in order to meet the objective. But if your project is also trying to reach groups that are socially, economically, culturally or geographically isolated, a high target for visitor numbers could be self-defeating. Be up front with partners and funders about how you've addressed any potentially conflicting objectives. Evaluation should always be used to identify areas of improvement. So always act on negative feedback and if you're not achieving what you set out to, think of what changes you can make. Audiences Having a clear and targeted audience makes everything much easier. Not only can you develop content and activities knowing that they are suitable for visitors, but visitors will know what to expect. If you plan to visit schools, then consider linking to a section of the relevant curriculum. Many mobile science projects do manage to target more than one audience, but the successful ones have a clear primary audience which takes precedence. If you are linking to a specific curriculum make sure that you involve teachers in the design of your activities. This can be more time consuming initially and sometimes more expensive, but it is essential for ensuring that your activities will work with the target audience and that other teachers will support your project. When you're thinking about content, be clear what it is you want visitors to achieve during their visit. In general, hands-on workshop formats are much better than shows at engaging visitors. However, shows can accommodate