<Li> The ((Timeline)) template is designed to show three items in a simple timeline, representing past, present, and future . It is convenient for navigation through a series of articles, e.g., the succession of people holding an elected office . It looks like this: </Li> <Table> <Tr> <Td> Foo 2009 </Td> <Td> Bar </Td> <Td> Baz 2011 </Td> </Tr> </Table> <Tr> <Td> Foo 2009 </Td> <Td> Bar </Td> <Td> Baz 2011 </Td> </Tr> <Ul> <Li> The use of fixed images, such as File: Narnia Timeline. svg, was common in the past . However, these are difficult or impossible to adjust later, so this approach is frequently not the best option . </Li> <Li> In other cases, whole articles or sections present timelines in text as association (definition) lists . Timeline of chemistry is a featured list that uses this style to good effect . </Li> </Ul>

When do we use pie-chart and bar graph chart model