Whereas constraints tie tasks to the project start or end or to particular dates, dependencies tie tasks to the timing of other tasks in the project. Dependencies are central to visualizing the true length of a project.
Dependencies exist because all tasks in a project rarely can happen simultaneously; usually, some tasks must start or finish before others can begin. Tasks overlap for many reasons; for example, the inability of resources to do more than one task at a time, the lack of availability of equipment, or the nature of the tasks themselves (you can't start construction until you receive a construction permit). You can't know the total time that you will need to complete a project until you establish durations and dependencies. For example, a project that comprises five 10-day-long tasks with no dependencies among the tasks takes 10 days to complete. But, if the tasks must happen one after the other, the project requires 50 days.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.