Numbers are often better understood if they are visualised. However, it is not enough simply to display a slide and read out the contents. The lecture should incorporate an explanation or interpretation so that the purpose of the illustration can be fully understood. Continuous line graphs, 'river' and 'area' plots show trends clearly. Flow of events, physical relationships.
Simple diagrams convey more than photographs of equipment.
Short lists of key thoughts and sequences of events can help the audience to keep track of complex happenings. Colour and monochrome photographs can also be displayed. Bar or pie charts are more effective. Avoid computer printout at all costs. 2.3 Good Practice Focus on one point at a time.