Presentation skills in SA with diagrams and graphics shouldn't be overemphasized as someone called it "death by PowerPoint". People understand a presentation better than just a talk as this has various features on it like diagrams; graphics, pictures and written matter which are more explicit in making the audience grasp the matter better. A lot depends on the presentation skills in SA of the person or team which is getting it prepared and the success of the whole meeting will depend on this. Those in the management cadre and the top brass of the organization will have their subordinates to do the presentation for them while they fine tune it in the end. Certain people are retained just for their magnificent presentation skills in SA as they have an aptitude for this and help in making a presentation valuable.