Workload without Resources in MS PROJECT– BUG OR NOT?


In this post I will show some “strange” behavior of MS PROJECT 2010 when I assign two resources to the effort driven, fixed duration Task!

First, as always, set up! I will add two resources to the Project:


Now I will arrange my Gant Chart View in the way that I will add Work field, and I will apply Task Form as a detailed View:


Now I will add a brand new Task:


Now I will assign Resource 1, and Resource 2 to the Task, at the same time:


and I will get:


As you can see, Each Resource will work 6 hours per day with 150% units!? In MS PROJECT 2007 Units were 75% (6 hours are 75% of 8 hours, regular working time)! From my point of view, MS PROJECT 2010 consider that Each resource will work 12 hours and that will be 150% Units, because 150% of 8 hours = 12 hours!! Is it a BUG? Well, this is my opinion: YES, SURE IT IS!

Now, I will change Duration from 1 day to 2 days:


and I will get:


The explanation:

  • Old Duration = 1 day, new Duration = 2 days
  • Old Work (total) = 12 hours, new Work (total) = 48 hours
  • Old Work (per Resource) = 6 hours, new Work (per Resource) = 24 hours
  • Old Units = New Units = 150% per Resource
  • WORK = DURATION * UNITS. Since Duration is 2 days, and the Task is Fixed Duration, MS PROJECT 2010 now calculates: WORK = 2 days * 150%. = 2 days * 2 resources * 8 hours per day * 150% = 4 * 8 * 150% = 32 * 150% = 48 hours!





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, MS PROJECT 2010, MS PROJECT 20101, PMI, PRoject Management and tagged , , , , . Bookmark the permalink.

2 Responses to Workload without Resources in MS PROJECT– BUG OR NOT?

  1. emmanuele says:

    i’ve seen there is a bug on calculation of USE!
    there are 2 conditons of fault:

    a) fixed work,,, you change duration… nothing happens to resource % use
    b) fixed Duration … you change work … nothing happens to resource % use

    BUT is not deeply true!!! if you goes to “resource diagram” the % is recalculated,,,
    I think something is missing in the code.
    It’s a pity becaue for me the automatic calculation of use% was very useful!!!!


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