Integrated Cost and Schedule Control

It is generally known that without a good planning it is rather difficult to implement a project successfully. However, appropriate planning does not guarantee a successful execution of the project because the future is highly unpredictable and uncertain. Therefore, it is really important to control how the different tasks are progressing. In order to get an overview of the current situation of the project, we should compare the actual state with the planned program in terms of Scope, Schedule and Costs.

When it comes to measuring project performance, the planned schedule can be compared to the accomplished one (Schedule Control). But at the same time, the budgeted cost and the actual cost can also be balanced (Cost Control). Nevertheless, if these aspects are analysed separately, one can initially think that if a project meets the objectives of cost, it is on plan, but the truth could be that it is in reality delayed. In cases like the previous example, how do we actually know the overall situation of the project? How can delays be compared with monetary data? A very useful method to achieve all this goals without subjective interpretations of the reality is the Earned Value Management (EVM) technique, which will be one of the main topics developed in the present article. Moreover, with this method you can not only evaluate the performance of the project at any time, but also analyze future trends to estimate the cost and time of completion of the project.

Background

Figure 1: Project Management Process Groups.

According to PMI's PMBOK® Guide:

The Monitoring and Controlling Process Group consists of those processes required to track, review, and orchestrate the progress and performance of the project; identify any areas in which changes to the plan are required; and initiate the corresponding changes. The key benefit of this Process Group is that project performance is measured and analysed at regular intervals, appropriate events, or exception conditions to identify variances from the project management plan.

Therefore, the control of schedule and cost should be part of the mentioned Monitoring and Controlling Process Group. Furthermore, controlling the performance of the different tasks shouldn't be understood as an isolated activity, but has to be present during all the lifecycle of the project. This fact is clearly reflected in the PMI's PMBOK® Guide:

The integrative nature of project management requires the Monitoring and Controlling Process Group to interact with the other Process Groups, as shown in Figure 1. Monitoring and Controlling processes occur at the same time as processes contained within other Process Groups. Thus, the Monitoring and Controlling Process is pictured as a “background” Process Group for the other four Process Groups shown in Figure 1.

Once this global perspective of when to control a project is comprehended, one can move on to identify the different tools and techniques that can be used regarding the control of schedule and cost. First of all, the Judgment of Experts is a really important method regarding the interpretation of the data coming from the observation of how the project is developing. The main objective of this method is to determine which are the actions that the project manager, together with his team, decides to implement to ensure that the actual performance meets the planned requirements. Secondly, the use of Analytical Techniques can provide an overview of how the project is going to develop and help to prognosticate the way things are going to turn out. Examples of these tools are Root cause analysis (RCA), Forecasting methods, Failure mode and effect analysis (FMEA), Fault tree analysis, Variance analysis and the one developed below in this article, the Earned Value Management technique. Thirdly, by using the Project Management Information System you can access performance indicators, records and financial data that will definitely help in the process of monitoring and controlling project work process. Finally, the use of Meetings including project team members and stakeholders are also very useful.

Over the years, all these different techniques have been used to control cost and schedule, but usually such supervisions have been done separately. However, the best option concerning the objective of obtaining an overall impression about how the project is progressing is to integrate the control of both aspects. Therefore, even when the two first methods (Schedule Control and Cost Control) are also interesting and will be shortly described, the main method developed in this article is the EVM.

Benefits

The main rewards that can be obtained by controlling the cost and schedule of the different tasks of a project and that describe the purpose of this tool, are stated below:

• Achieving better management visibility.
• Developing disciplined planning.
• Planning and meeting the expectations of realistic schedules.
• Developing achievable objectives.
• And, finally, the project ending on schedule and within budget.

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Application

Besides all those cases when the application of the current technique is used to achieve the benefits mentioned before, it is also a great tool concerning the “Learning by Doing” philosophy. By controlling the schedule and cost of a project, you can analyse which factors have gone wrong, the reasons of these problems and thereby, improve the planning and performance of future projects.

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Schedule Control

Schedule Control is understood as the process of monitoring the status of project activities to update project progress and manage changes to the schedule baseline to achieve the plan . Moreover, the main reason to use this type of control is to minimize risk by recognizing deviations from the planned schedule and taking corrective and preventive actions.

In order to perform the Schedule Control, the next steps should be followed :

1. Development of schedule using management tools such as the Work Breakdown Structure (WBS), Scope Baseline and the Work Packages, which give information of the tasks that need to be completed in terms of resources needed, time to complete it, budget, required inputs from other tasks, sequence of activities, etc.
2. Communication of the schedule using, for example, a Gant Chart.
3. Evaluation and information of how the project is being accomplished.
4. Comparison of the actual project performance against the project management planned schedule.
5. Identification of problems comparing the planned schedule to the executed one.
6. Development of procedures for correcting such errors and schedule redirection.

There are some really useful tools and techniques in order to develop the Schedule Control according to the steps mentioned before. Some of them are mentioned in Table 1.

Table 1: Schedule Control tools and techniques.

Tool or technique	Use
Trend analysis	Examines project performance over time to determine whether performance is improving or deteriorating. Graphical analysis techniques are valuable for understanding performance to date and for comparison to future performance goals in the form of completion dates.
The Critical Path Method (CPM)	Comparing the progress along the critical path can help determine schedule status. The variance on the critical path will have a direct impact on the project end date. Evaluating the progress of activities on near critical paths can identify schedule risk.
Critical Chain Project Management	Comparing the amount of buffer remaining to the amount of buffer needed to protect the delivery date can help determine schedule status. The difference between the buffer needed and the buffer remaining can determine whether corrective action is appropriate.
Variance Analysis	Comparing planned activity start or finish dates against actual start or finish dates to identify variances between the schedule baseline and actual project performance. Further analysis can be performed to determine the cause and degree of variance relative to the schedule baseline and any corrective or preventative actions needed.
Project Management Software	Project management software for scheduling provides the ability to track planned dates versus actual dates, to report variances to and progress made against the schedule baseline, and to forecast the effects of changes to the project schedule model.
Resource Optimization Techniques	Involve the scheduling of activities and the resources required by those activities while taking into consideration both the resource availability and the project time.
Modeling Techniques	Are used to review various scenarios guided by risk monitoring to bring the schedule model into alignment with the project management plan and approved baseline.
Leads and Lags	Adjusting leads and lags is applied during network analysis to find ways to bring project activities that are behind into alignment with the plan.
Schedule Compression	Are used to find ways to bring project activities that are behind into alignment with the plan by fast tracking or crashing schedule for the remaining work.
Scheduling Tool	Schedule data is updated and compiled into the schedule model to reflect actual progress of the project and remaining work to be completed. The scheduling tool and the supporting schedule data are used in conjunction with manual methods or other project management software to perform schedule network analysis to generate an updated project schedule.

When is it applicable?

Schedule Control is most applicable when the project has to meet with a delivery date and this actually characterizes the majority of the projects. However, completing a project on schedule is important not only in terms of time but also economically. Reducing the duration of a project can impact the overall costs in terms of less salary payments, interests on loans or preventing loss of profit (For example, if a project consists on developing a new toy before Christmas and it finishes in February, all the profits of the Christmas campaign will be lost).

Cost Control

Figure 2: Cost Control comparison.

Cost Control is known as the process of monitoring the status of the project to update the project costs and managing changes to the cost baseline. This technique also helps to understand how the project is progressing and to minimize risks.

A Cost Control system should follow the next steps :

1. Distribution of the budget through the different tasks of the project and creation of a cost baseline, which will be the planned budget accumulated over time. The data can be based on historical results or theoretical cost performance.
2. Monitoring the ongoing project activities.
3. Comparison of the planned and actual performance (Figure 2).
4. Calculation of the variances and investigation of the reasons of those which are unfavorable.
5. Analysis and implementation of corrective measures.

When is it applicable

It could be said that Cost Control is applicable in all projects due to its importance in reducing risks and overcosts. Moreover, Cost Control is also very important in those projects where the Quality Control is essential. This is because in those type of projects, the client usually verifies that the performance meets with the specifications before authorizing payments. Therefore, Cost Control will be strongly influenced by the delivery quality. On the other hand, the knowledge gained from this control allows to make better estimations for future projects.

Drawbacks and Limitations

It is very important that the data concerning how cost and schedule are developing are as precise and consistent with reality as possible. On the one hand, regarding the control of the progress of a project, it is very important that the capture of the state of a task is part of the work that has to be developed in each of the Work Packages. In other words, the workers should understand that the process control is one of their obligations and that they should provide feedback of the deviations that they detect as quick as possible. On the other hand, the control should be done over how the work is going on and not over how the employees are working. With this two indications concerning the human resources, the results of the control would be more objective and reliable. If the previous is not happening, the whole control process will be based on inaccurate data.

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References

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