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Project planning may make you think of Microsoft MSProject, or maybe it makes you think of advanced Enterprise resource planning (ERP) software packages.
Important things for this pattern of time visualization and manipulation is:
1. Hierarchical view
2. An that encapsulate child rows
3. Move child rows when moving spans
4. Ability to show progress in individual tasks
5. Ability to show and change relations between tasks
6. Ability to differentiate tasks that have length from milestones that does not
7. Disallow move between rows
8. Edit grid values
9. Different layouts of different grid cells