The diagram above shows a randomly-generated activity-on-node network. Drag nodes or put your mouse/pointer down near a node to start drawing an arrow. To get rid of an arrow, draw another in the opposite direction.
You can create a new problem by pressing your browser’s refresh button. If you want to see how these networks are drawn, try the pert/cpm web page. If you want to see how Gantt charts are drawn, try the Gantt chart page.
If this page doesn’t work properly in your web browser, try this web page, which has a java version of a similar problem.