Main reasons for ineffective presentations are lack of significance, structure, simplicity, and rehearsal. Significance creates passion which attracts attention and leads to action. Structure is how the building blocks of a story are placed and needs to be convincing, memorable, and scalable. Simplicity means making ideas as simple as possible without oversimplifying. Rehearsal helps improve a presentation through practice and checking. An effective presentation addresses significance, structure, simplicity, and includes rehearsal.