Slack (or Float) types in Microsoft Project 2013, Part 1

 

Hi,

Today I am going to explain slack, or float in MS PROJECT 2013.

There are two types of slack in MS PROJECT 2013:

  1. Free slack:
    The free slack of an activity is the time this activity can be delayed without impact on the following activity.
  2. Total slack:
    The total slack of an activity is the time this activity can be delayed without impact on the finish date of the project.

First, let me show you that on this pictures:

image

image

Here is the example:

image

As you can see, The Critical Path is: Prepare Outline –> Create Slides –> Add Artwork to Slides –> Review & Spell Check. Tasks Crate Artwork, and  Write Speakers Notes are not on the Critical path and they have a Slack!

  1. Task Crate Artwork has Free slack = 22 – 12 = 10 days
  2. Task Write Speakers Notes has Free slack = 22 – 3 = 19 days
  • If Create Artwork Task is late more than 10 days, Task Add Artwork will be late, as well.
  • If Write Speakers Notes Task is late more than 19 days, Task Add Artwork will be late, as well.

Now I am going to put those Tasks into MS PROJECT 2013.

image

As you can see, My Project will take 25 days!

Now I will apply Detail Gant View:

image

and then:

image

and I will get (I will show two pictures because it doesn’t fit on the screen):

image 

and:

image

You can see that Tasks  Create artwork, and Write Speakers Notes are not on the Critical path and you can see their Free Slack (10 an 19 days)!

Now I will add two new field in my Detail Gant View: Free slack, and Total Slack:

image

As you can see my calculation is correct.

Slack can be positive, zero, or negative!

Total slack can be different from free slack, of course!

Do you want an example? Read my next post!

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 1

  1. Alex Zamani says:

    Hi,
    I have a question about Slack, I am preparing a construction schedule for my small project and using M.S.P. the problem I have is, when I active the slack on the schedule, I realize that on the total slack column, I can not see the total slack for whole project and shows ZERO but on the individual items shows we have slack. How come I can not see total slack on my whole project??? even if I add some more tasks on the critical items again on the top of my schedule ( usually it is name of a project and you can see duration of project, total slack for whole project) show total slack for whole project is again ZERO. Could you please explain me, who can I show on my schedule how many days we have + or – slack for whole project?
    Thank You, Alex Zamani

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