Hi,
A question from my Blog reader is: “Please clarify the purpose of fields Schedule Duration, Schedule Start & Schedule Finish. In which context they are used and how they differ from Duration, Start & Finish Fields ?”
I will show that in MS PROJECT 2013. First of all, the best use for this field is for Manually Scheduled Task. Suppose that you have one Manually Scheduled Task in MS PROJECT 2013:
and three Resources in Resource Sheet:
I will assign all three Resources to the Task:
Now, suppose that John Will work only at Wednesday, Mary at Thursday and Friday, and Paul at next Monday and Tuesday. I will use Task Usage View for that:
Of course I added this hours Manually to specific days.
Let’s look at Gantt Chart View:
Duration, and Finish Date is empty. Now I will add three new columns in Gantt Chart View:

As you can see Duration is still empty, but Schedule Duration is now % days, so you can enter this Value in Duration Field.
If I do the Same thing with Auto Schedule Task I’ll get:
Duration is same sad Schedule Duration, so best use for this fields are for Manually Scheduled Task!
Regards.
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About Nenad Trajkovski
Location: Zagreb, Croatia
Occupation: Project Manager
Interests: Project Management and MS PROJECT
He was born in Zagreb, Croatia at 1963. After completing his college he started working on projects in different business areas (banking, manufacturing, automotive industry, distribution, oil companies, etc.) developing and implementing ERP systems into different companies. He has got a lot of experience working with people in different business processes and also possesses great knowledge in information technologies and financial services. Today he works as a business consultant, adn Project Manager in PERPETUUM MOBILE d.o.o. Zagreb. He is a regular lecturer for Project Management in MS Innovation Center in Varaždin, Logosoft Sarajevo in Bosnia and Herzegovina and SEAVUS GROUP in Skopje Macedonia. He was named the best lecturer of WINDAYS 2008 while his lecture was also voted as the best. In addition, he was in TOP 10 lecturers at the MS SINERGY 2009 and MS VISIA 2009, 2010. Shares first place as the best lecturer of KulenDays 2009 and 2010 and PMI Conference 2009 in Zagreb. He is also a regular lecturer in the MS Community. He is a Certified Accountant and a PMP (Project Manager Professional) and a PMI-RMP (Risk Manager Professional), MCP, MCT, and Microsoft Certified Technical Specialist - Microsoft Project 2010. From 01.01.2012 awarded with MVP (Microsoft Most Valuable Proffesional - Microsoft Project)!