So let's take an example of another bar chart or Gantt chart here. From what we're seeing here, we have, how many activities? We have, in the y-axis here, the activities names from A, B, C all the way to activity H. And each activity represents its bar chart with the x-axis, and as we see we see here, it's not in months, it's not in days, it's in weeks. And if I ask you activity A how many months is needed to finish, you can easily tell it needs six months. Activity B around two months. This, how about activity D and E? It takes three months to finish and so on. So the question for you I have is, what is the duration of the project, one? And the second question I want you think about, is the following, bar charts or Gantt charts help tell us what the progress of the project at any week in the schedule. So the question here, based on the bar chart schedule here that we are showing, what is the planned progress for the project at week 11 based on the schedule? So the duration of the project as, maybe you guessed it, it's very simple. You look at the last activity we have here. The end of that activity will be the duration of the entire project of 20 days. Now, the question I all have for you is, based on the, this bar chart, what is the plan progress? If I am your manager or I am an executive or even I'm the client, asking you the question, on week number 11, what you're planning to do? So, in week number 11, what we can see here, we can comfortably say that we are planning to finish Activity A, Activity B, and we will be just finishing with Activity C. At the beginning of week 11 we are planning to start with both Activity D and Activity E. But we still did not touch or perform in anyway possible Activity F, or G, or H. This is one, second, if I tell you, okay, what about at the end of week 11, what's your plan? So, what's the right answer for that is, at the end of week 11, in addition to the A, B and C activities will be done we have activity D and E we're planning to finish around 33 or one over three % of the entire activity. Because it has three weeks and we have to finish around one week by the end of week 11 for both activities. As we can see here, we have one, two, three and if we're finishing the first week, we have only two weeks left, so one over three or of the entire activity. So bar charts can also represent many pieces of a project information. For example, in addition to show a simple start or a simple finish of each activity, it also can show the resources needed for each activity, such as to say budget or reliables needed on each activity. So let's take an example here. Bar charts usually use the x-axis as I mentioned on the time scale to show the duration on each of these bars for each activity. The y-axis can used to add items such as man hours, number of laborers or equipment needed or the budget. So I gave you here an example of using a budget in a bar chart. What that will tell us, for example, Activity A, it mentioned that we have a located budget productivity of around $110,000. Activity to say, E we have allocated budget of $60,000, Activity H, for example, we have allocated budget of around $240,000. So in general it shows resources. We can combine in this example the resources is the cost or the money used for each of the activities. And this variable is then usually shown as a curve imposed on the bar chart as I just show here in the graph. And as you can see why it looks like an S curve because in the beginning of the project most of the activities are starting very slowly. Until start to catch up and start to becoming more jammed, you're construction site, with much more activities. So the more activities there will be more sharp increase in the S curve where most of the construction activities are showing and taking place. So the resources will increase because this curve is a cumulative curve of, in this example, the budget. And towards the end if you notice start to flatten off and to becoming less steep as the first or the beginning of the project or the construction. And the reason is at the end you start to also reduce a lot of the activities and trying to finish all your projects to submit to the client. So, we can easily get some information from the bar chart. We can impose sometimes in the y-axis some resources, allocations, instead of just highlighting a start and a finish time on each of the construction activities. So let's take another example, and instead of showing you the schedule, and ask you what's the plan, or showing you the schedule, and shade some colors and tell you, okay are we ahead or behind the schedule? I'm going to ask you to start develop a bar chart. Let's take a simple example. Draw a bar chart for the following four activities. You have, A, B, and C, I gave you the starting week of each of these activities 1, 2, 3, and 3, and the duration of each activity. So in our example, here are the four projects, what we want to draw, the activities or the bar chart for, and as I mention to you, usually what we have, the x-axis are the number of weeks. We have the Activity A around three weeks, starting it from the first week. And you can easily look at Activity B, you go to second week and also draw another bar, the length of the bar also three weeks. Activity C starts from week number three and goes for only two weeks. The last activity we have here is Activity D, which is start also three as you can see here, and goes all the way to that end of week number six. So in this case, from what we can see here from simple example, that total duration of our simple project here of these four activities are six weeks.