- project management gantt
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Introduction to PM: What's So Great About Project Management
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Think about how challenging it would be to juggle a dozen balls at once. You'd have to keep your eye on all of them, and know when to catch each one. If you missed just one, this could spoil your whole performance.
Project management is similar to this. To complete a project successfully, you must control a large number of activities, and ensure that they're completed on schedule. If you miss a deadline or finish a task out of sequence, there could be knock-on effects on the rest of the project. It could deliver late as a result, and cost a lot more. That's why it's helpful to be able to see everything that needs to be done, and know, at a glance, when each activity needs to be completed.
Gantt charts convey this information visually. They outline all of the tasks involved in a project, and their order, shown against a timescale. This gives you an instant overview of a project, its associated tasks, and when these need to be finished.
In this article, we'll look at why they are so useful, and we'll see how you can use them to organize projects and keep your team informed of progress.
Origins of the Tool
In the late 1800s, Polish engineer Karol Adamiecki developed a visual work flow chart that he called a "harmonogram."
In around 1910, Henry Gantt, a management consultant and engineer, took Adamiecki's concept to the next stage. His chart was designed to help manufacturing supervisors see whether their work was on, ahead of, or behind schedule, and it formed the foundation of the tool we use today.
Why Use Gantt Charts?
When you set up a Gantt chart, you need to think through all of the tasks involved in your project. As part of this process, you'll work out who will be responsible for each task, how long each task will take, and what problems your team may encounter.
This detailed thinking helps you ensure that the schedule is workable, that the right people are assigned to each task, and that you have workarounds for potential problems before you start.
They also help you work out practical aspects of a project, such as the minimum time it will take to deliver, and which tasks need to be completed before others can start. Plus, you can use them to identify the critical path – the sequence of tasks that must individually be completed on time if the whole project is to deliver on time.
Finally, you can use them to keep your team and your sponsors informed of progress. Simply update the chart to show schedule changes and their implications, or use it to communicate that key tasks have been completed.
Creating a Gantt Chart
You can see an example in figure 1, below:
Figure 1 – A Gantt chart
(Click
here to expand this diagram.)
To create one for your project, follow these steps, using our example as a guide .
Step 1: Identify Essential Tasks
Gantt charts don't give useful information unless they include all of the activities needed for a project or
project phase to be completed.
Example
Your organization has won a tender to create a new "Software as a Service" product, and you're in charge of the project.
You decide to use a Gantt chart to organize all of the necessary tasks, and to calculate the likely overall timescale for delivery.
You start by listing all of the activities that have to take place, and you estimate how long each task should take to complete. Your list looks as follows:
| Task | Length |
|---|
| A. High level analysis | 1 week |
| B. Selection of server hosting | 1 day |
| C. Configuration of server | 2 weeks |
| D. Detailed analysis of core modules | 2 weeks |
| E. Detailed analysis of supporting modules | 2 weeks |
| F. Development of core modules | 3 weeks |
| G. Development of supporting modules | 3 weeks |
| H. Quality assurance of core modules | 1 week |
| I. Quality assurance of supporting modules | 1 week |
| J. Initial client internal training | 1 day |
| K. Development and QA of accounting reporting | 1 week |
| L. Development and QA of management reporting | 1 week |
| M. Development of management information system | 1 week |
| N. Client internal user training | 1 week |
Step 2: Identify Task Relationships
The chart show the relationship between the tasks in a project. Some tasks will need to be completed before you can start the next one, and others can't end until preceding ones have ended. For example, if you're creating a brochure, you need to finish the design before you can send it to print.
These dependent activities are called "sequential" or "linear" tasks.
Other tasks will be "parallel" – i.e. they can be done at the same time as other tasks.
You don't have to do these in sequence, but you may sometimes need other tasks to be finished first. So, for example, the design of your brochure could begin before the text has been edited (although you won't be able to finalize the design until the text is perfect.)
Identify which of your project's tasks are parallel, and which are sequential. Where tasks are dependent on others, note down the relationship between them. This will give you a deeper understanding of how to organize your project, and it will help when you start scheduling activities on the chart.
Note:
In Gantt charts, there are three main relationships between sequential tasks:
- Finish to Start (FS) – FS tasks can't start before a previous (and related) task is finished. However, they can start later.
- Start to Start (SS) – SS tasks can't start until a preceding task starts. However, they can start later.
- Finish to Finish (FF) – FF tasks can't end before a preceding task ends. However, they can end later.
A fourth type, Start to Finish (SF), is very rare.
Tip 1:
Tasks can be sequential and parallel at the same time – for example, two tasks (B and D) may be dependent on another one (A), and may be completed at the same time. Task B is sequential in that it follows on from A, and it is parallel, with respect to D.
Tip 2:
To minimize delivery times, you'll need to do as much work in parallel as you sensibly can. You also need to keep the
scope of the project as small as possible.
Example
| Task | Length | Type* | Dependent on... |
|---|
| A. High level analysis | 1 week | S | |
| B. Selection of server hosting | 1 day | S | A |
| C. Configuration of server | 2 weeks | S | B |
| D. Detailed analysis of core modules | 2 weeks | S, P to B, C | A |
| E. Detailed analysis of supporting modules | 2 weeks | S, P to F | D |
| F. Development of core modules | 3 weeks | S, P to E | D |
| G. Development of supporting modules | 3 weeks | S, P to H, J | E |
| H. Quality assurance of core modules | 1 week | S, P to G | F |
| I. Quality assurance of supporting modules | 1 week | S | G |
| J. Initial client internal training | 1 day | S, P to G | C,H |
| K. Development and QA of accounting reporting | 1 week | S | E |
| L. Development and QA of management reporting | 1 week | S | E |
| M. Development of Management Information System | 1 week | S | L |
| N. Client internal user training | 1 week | S | I, J, K, M |
* P: Parallel, S: Sequential
Step 3: Input Activities Into Software or a Template
You can draw your charts by hand or use specialist software, such as
Gantto,
Matchware, or
Microsoft Project. Some of these tools are cloud-based, meaning that you and your team can access the document simultaneously, from any location. (This helps a lot when you're discussing, optimizing, and reporting on a project.)
Several Gantt templates have been created for
Microsoft Excel, and you can also find free templates with a quick search online.
Figure 2 – Example Gantt chart
(Click
here to expand this diagram.)
Step 4: Chart Progress
As your project moves along, it will evolve. For example, in our scenario, if quality assurance of core modules revealed a problem, then you may need to delay training, and halt development of the management information system until the issue is resolved.
Update your chart to reflect changes as soon as they occur. This will help you to keep your plans, your team, and your sponsors up to date.
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