In a meeting where you have multiple themes to discuss, it’s best not to confuse your participants. Confusion leads to inattention, which can be disastrous given you’re competing with 25 people’s in-boxes, Facebook profiles, and smartphones.
At the beginning of your meeting, it’s always nice to outline what you’ll be talking about in the order in which it will happen. This way, participants have a clear picture of everything discussed and will have something to anticipate. And be brief! Take a maximum 30-40 seconds to deliver your outline.
Even better: write down your outline before the meeting and send it out via email. This way, when you reintroduce the outline during the meeting, your participants will already be familiar with what you’re talking about.