Purposes of Schedule

From last week to this,I made a plan of our team for project management in 2007.It a hard process,really,I think.You need take care everything about project,such as collabaration,communication,timestamp,customer feedback and so on. And by accident, the chapter 2 is written about schedules.For me, right~!

First,I review the three purposes about schedule:
1.To make commitments about when things will be done.
2.To encourage everyone who's contributing to a project to see her efforts as part of a whole, and invest in making her pieces work with the others.
3.To give the team a tool to track progress and to break work into manageable chunks.

For three purposes, it's very hard to understand when I looked at them firstly.The first, time is focused on. It means we focus on what will happen and what will change,or what will delay.The second,it emphasize function of schedules.It means scheduls inspirit person who is in team,and in another way,it is a forcing functions for project.The last,it's easy to understand as long as whoever have expriences of IT project.