ABSTRACT
Bar and column charts are the most common of all the chart types used in presentation graphics. This is a testimony to their ease of creation and versatility, and their general acceptance in company reports. These charts can represent both changes in time or item comparisons in either a vertical (column) or horizontal (bar) format. Vertical columns are best for time series comparisons (similar to line graphs) and horizontal bars are best for item comparisons. The main graphic components of these charts are their rectangular areas whose lengths indicate the data values.
