What is the best strategy to prepare your 15 minute talk, about a scientific topic? And what is the pitfall to avoid? These 20 slides will help you to make the first necessary step in the process of preparing your content. It's useful for experienced scientists as also for PhD students and other professional speakers. I coach many speakers in their preparation for talks of different time frames and audiences. In all speeches the strategy of composition is crucial for its success. More information can be found at https://www.presentingonstage.com/en/