Gantt Chart | Project management

Gantt chart is the graphical representation of materials and production schedules for various activities of the project.

It is a project management tool.

What is the Gantt Chart and why it is important?

Mr Henry, L. Gantt evolved a chart of planning and controlling the production of ordinate factories, which is known as a Gantt chart or Bar chart.
The bar chart consists of two coordinates.
  1. Horizontal coordinates
  2. Vertical coordinates
The horizontal ordinate represents the duration required for completion of the activities
The vertical abscissa represents the respective jobs to be performed.
The length of the bar shows the time taken by the job or activity for its completion.
The duration of the activities represents from left to right.
Each bar is divided longitudinally into two portions.
  1. Top portion
  2. Bottom portion
The top portion indicates the process of completion of the activities
The bottom portion indicates the duration of the activity.
For More topics : Open Easy Home Builds Website

Importance and Advantages of Gantt Chart

The following are the main advantages of the bar chart.
  1. Easy to draw and to understand
  2. A person without experience can easily make the chart.
  3. Very easy to make the comparison of progress of activities and the original schedule.
  4. Using this chart can know the resources requirement time for each activity.
  5. If required we can modify the chart very easily.
  6. Using this chart it is easy to make inter-relationship between various activities.

Limitations of the Gantt chart, Project management tool

The following are the limitations of the gantt chart
  1. Interdependencies of activities
  2. Project progress
  3. Un-certainties

1. Interdependencies of activities

A project can have a large number of activities which can start at different intervals of time.
The bar charts fail to indicate clearly the interdependencies among such activities.
Simply drawing the bars of the activities, parallel to each other, does not always make them related or interdependent or completely dependent.
Gantt chart example:1
In a concreting operation, the following activities are involved
  1. Mixing the ingredients
  2. Transportation of concrete
  3. Placing of concrete
  4. Compaction of the concrete
  5. Curing of the concrete
These activities have to run in proper sequence serially
One activity must be completed before its succeeding activity can start.
On a bar chart, the bars representing these activities are not allowed to overlap.
Example 2 :
Another drawback of a bar chart is that two parallel bars need not always represent independent activities.
Let us image the project have the following activities whose duration are given below
  1. Excavation of foundation – 24 days
  2. Erection of the shuttering – 14 days
  3. Placing of concrete – 10 days
For the execution of these activities in strict sequence,
The total time required for the completion of the project = 24 + 14 + 10 = 48 days
But, in this case, one need not wait for complete excavation of the foundation for the starting of the next activity of the creation of the shuttering.
Say, after 12 days of excavation of foundation, erection of shuttering of sideboards may be started.
Similarly, after 6 days of erection of shuttering, the concreting activity can be started.
According to the above durations,
The timeline for Erection of shuttering of sidebars will be 13th day to  26th day.
The timeline for the placing of concrete will be 18th day to 28th day.
According to above, Gantt chart schedule to time schedule,
Shuttering still needs 2 days after excavation work is over.
Similarly, placing of concrete will have 2 days work after the erection of shuttering.
If due to some unforeseen reasons, excavation work or erection of shuttering is delayed by one day,
how this delay will affect the subsequent activities cannot be indicated by the bar chart.

2.Project Progress

A bar does not indicate the progress of the project,
So this chart cannot be used as a control device.
In every project, it is essentially required to have up to date knowledge of the amount of work in progress or work completed.
The changes in plans of a large project may be suitably made on a bar chart.


The most important limitation of the bar chart is that it cannot affect the uncertainties or tolerances in the timeline schedules of the various activities of the project.
If uncertain activities are found, they can not be forecasted with exactness using this bar chart.
In modern projects, programme rescheduling of activities necessary part of the project but this cannot be reflected on a bar chart.
Read also:
Critical Path method|Project management

About Ashwini Kumar

Ashwini Kumar is a graduate in civil engineering from NIT Warangal. He has 8+ years of experience in the construction field. He is the author, founder of the Easy Home Builds blog

View all posts by Ashwini Kumar →

62 Comments on “Gantt Chart | Project management”

  1. Howdy! This is my first comment here so I just wanted to give a quick shout out and tell you I truly enjoy reading through your articles. Can you suggest any other blogs/websites/forums that deal with the same topics? Thanks a ton!

  2. Hey there, You have performed a great job. I will definitely digg it and personally suggest to my friends. I’m sure they will be benefited from this web site.

  3. I抳e been exploring for a little for any high quality articles or blog posts on this kind of area . Exploring in Yahoo I at last stumbled upon this site. Reading this information So i am happy to convey that I have a very good uncanny feeling I discovered just what I needed. I most certainly will make sure to do not forget this website and give it a look regularly.

  4. Excellent read, I just passed this onto a colleague who was doing a little research on that. And he just bought me lunch as I found it for him smile Thus let me rephrase that: Thanks for lunch!

  5. Very nice post and right to the point. I don’t know if this is really the best place to ask but do you people have any thoughts on where to get some professional writers? Thx 🙂

  6. Hey there! Someone in my Facebook group shared this site with us so I came to check it out. I’m definitely loving the information. I’m book-marking and will be tweeting this to my followers! Superb blog and great style and design.

  7. Hello there! I know this is kinda off topic however I’d figured I’d ask. Would you be interested in exchanging links or maybe guest authoring a blog post or vice-versa? My site discusses a lot of the same topics as yours and I believe we could greatly benefit from each other. If you might be interested feel free to send me an e-mail. I look forward to hearing from you! Awesome blog by the way!

  8. Hello would you mind stating which blog platform you’re working with? I’m going to start my own blog soon but I’m having a hard time selecting between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your design seems different then most blogs and I’m looking for something completely unique. P.S Sorry for getting off-topic but I had to ask!

Leave a Reply

Your email address will not be published. Required fields are marked *