Slack (or Float) types in Microsoft Project 2013, Part 2

 

Hi,

Let us continue with Slack story in MS PROJECT 2013.

First I will create a new Project with Task List:

image

Because picture is too big I will show you the Gant Chart:

image

Now, again I will apply the Detail Gant View:

image

and:

image

and I will get:

image

OK. Let me explain!

Task 1, and Task 2¨are on the Critical Path. On the Critical path if any Activity (Task) is late, the whole Project is late, so in the Critical Path, slack is ZERO!

I will now show you the Free Slack, and the Total Slack fields!

image

  • Task 1, and Task 2 are on the Critical Path, so the Free Slack, and Total Slack are zero
  • Task 3 is predecessor of Task 4 and it has Free Slack zero days (because free slack is amount of time that Task can be late without making late his successor), but Total slack is 10 days, because if Task 3 is late 10 days, the Project will still finish on time!
  • Task 4 has 10 days of Total Slack, and free slack, because it has no Successor!
  • Task 5 has 9 days of Free slack (because Task 6 should start after Task 4, and Task 6 are finished). It has 18 days of Total Slack, and that is obvious, because if it is late up to 18 day, the Project will still be on time!
  • Task 6 has 9 days of Total Slack, and free slack, because it has no Successor!
  • Task 7 is predecessor of Task 6 and it has Free Slack zero days (because free slack is amount of time that Task can be late without making late his successor), but Total slack is 9 days, because if Task 7 is late 9 days, the Project will still finish on time!
  • Task 8 is the same as Task 7

OK. Can Float be negative? Yes it can!

Here is the example:

image

Now I will put a hard constraint to the Task 3, so it Must Start on January 10, 2013:

image

and I will get the Warning:

image

and then:

image

Finally I will get:

image

As you can see, because Task 2, and Task 3 has Finish to Start Relationship, and Task 3 must begin one day before Task 2 is finished it has –Slack 1day (negative slack).

 

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)!
This entry was posted in MICROSOFT PROJECT, Microsoft PRoject 2010, Microsoft Project 2013, PMI, PRoject Management and tagged , , , , , , . Bookmark the permalink.

One Response to Slack (or Float) types in Microsoft Project 2013, Part 2

  1. hieuhotrung says:

    Excellent

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