I have a list of scheduled tasks. In one column is the time the task
started. In the next column is the time the task ended. Many of these
tasks overlap. (Two or more task are running at the same time,
starting and ending at different times.)

I want a chart that shows how the tasks overlap. I'm thinking of a
chart that has a standard time line for both x and y axis. The for
each time on the x axis where a task began there are two dots
connected by a line. The lower dot is when the task started, the upper
dot when it ended and the line represents the duration. Then I could
scan my eyes across the chart and see where the tasks are overlapping.

Anyway, this is just my idea of how it should look. I'd welcome any
suggestions on how to represent this data.

tod