Risk assessment using Failure mode and effects analysis

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Abstract

Failure mode and effect analysis (FMEA) is a risk assessment tool used in project management. It is used to systematically identify and eliminate known or potential failures in complex systems to provide data and information for risk management decisions. The tool can be traced back till the 1940’s where it originated in the US military and were used for complex development projects. The tool identifies possible failure modes, causes and resulting effects in relation to either a product, process, or service. The tool is a semi-quantitative method and therefore in relation to risk assessment must provide the user with a numerical output value. The way of doing this is using the risk priority number (RPN), which in the aspect of risk assessment is a vital part of the FMEA. In brief the 3 parameters of the RPN are discussed: severity (the consequence of the failure happening), occurrence (probability/frequency of the failures occurrence) and detection (the likelihood that the failure is detected before the impact of it happens), these numbers can all be between 1-10. The scale of these numbers has been criticized in other articles (such as Garcia et al., 2005) and therefore a standard scale for evaluation of the parameters is presented .

Before diving into the specifics of the tool the article will explain the purpose of risk assessment, its placement in the risk management process and hereby also the purpose of the tool usage. This is followed by a thorough explanation of the application of the FMEA tool as well a discussion of the limitations of the tool. Discussed on the basis of when and how it is applied. . As the knowledge of the people using the tool also effects the outcome a discussion of how and what project managers should do to get the most useful outcome from the tool is explained together with the importance of diversity in relation to the tool.

FMEA and its placement in the risk management world

Describe the tool, concept or theory and explain its purpose. The section should reflect the current state of the art on the topic Explanation of tool and risk assessment Here will be a figure with boxes describing each step in the risk assessment process with steps focused on marked out

Depending on what organization one consults the major steps to be taken in the process of analyzing and managing risks is somewhat inconsistent. ISO has one approach, Society for Risk Analysis (SRA) has another and finally the Project Management Institute (PMI) has a third one. This is the one used for the following sections and is shown below in the figure..

Figure 1 - Risk management process with risk assessment part marked with the blue area and risk analysis with the green area.

As it has also been outlined on the figure, marked with the blue area, risk assessment is a part within risk management and makes up a few of the steps of the whole process. The risk assessment then again has a subpart which is the risk analysis, this can be either quantitative and qualitative. In the case with FMEA, the method is used both to identify risk, analyze them (using a mostly quantitative risk analysis) as well as proposing plans for risk response.

Introduction to the purpose of risk assessments

Before we dive into a further explanation of the tool itself, we begin with an explanation for why to use such tool. This starts with a basic description of what risk assessment is. The first step is to understand what risk means. Therefore the following definition from PRINCE2 is used as a baseline for what risk is in this article. An uncertain event or set of events that, should it occur, will have an effect on the achievement of objectives. A risk is measured by a combination of the probability of a perceived threat or opportunity occurring, and the magnitude of its impact on objectives. . Other definitions exist but this is the one that will be used here. As seen from the quote PRINCE2 define risk as both threats and opportunities, however most risk assessments mainly focuses on the threats. The reason for this is the negative impact threats can have for projects and thus the the need to evaluate and assess risks using risk assessments arises.

Risk assessment are relevant in the project mangament world as all projects undergo phases and parts that include uncertainties in the form of risks. This is inevitable and certain. Therefore, part of the project managers task is to be able to manage these risks. Part of the risk management process involves assessing the threats and vulnerabilities in the project. From this information the project manager must enforce countermeasures that are to be implemented to reduce the risks. A strong basis for making this decisions is vital and this is where a good risk assessment tool plays an important role in helping the project manager to respond the best way.

To give a relatable example the risk assessment process is viewed from the perspective of security management where it is described as: “A risk assessment is a quantitative, qualitative, or hybrid assessment that seeks to determine the likelihood that an adversary will successfully exploit a vulnerability and the resulting impact (degree of consequence) to an asset.” . This is actually quite intuitive and the very same process that is used to make a risk assessment in a project. The only difference is that the adversaries are the things that can go wrong and the asset is the project. So to sum up, a risk assessment is one or more methods/tools that are used to discover what can go wrong and how big the impact will be if it happens.

How to make a risk assessment

Mention and explain types of risk assessments. There are multiple types of risk assessments but all of them are either quantitative or qualitative - or a hybrid.

Quantitative risk assessments

Evidence based with objective results as each risk gets assigned numerical values. Usually requires more time and bigger investment. Used for larger projects.

Qualitative risk assessments

Might use descriptive scales instead, as high medium low. Solely based on the individual’s perception on what risks are most important. Is usually quicker and requires a smaller investment. Might be used where no data is available. Used for smaller low value projects.

FMEA for risk assessment

Description of what sort of risk assessment method this is

Can argue for both qualitative and quantitative In most cases it will be a hybrid The values used will be based on the subjectivity of the individual grading the risk, however it is based in multiple parameters in the end

Application

Provide guidance on how to use the tool, concept or theory and when it is applicable

In-depth explanation of how and when to apply the tool as well as detailed examples.

When to apply FMEA

Where in the project management face does one need to be to use it?

Most of the time FMEA is used in development projects and it was also primarily these sort of projects it was developed for. The main thing is that the method is designed to find/describe failure modes in a system and evaluate them. Usually the following three types of development projects represent the use case for FMEA quite well.

   -product development projects
   -processe development projects
   -service development projects

How to apply FMEA

Here will be a figure showing the elements in matrix of the FMEA. So the FMEA always does the following three things

   -Identify possible failure mode
   -Identify consequence
   -Identify causes

RPN number

This is the severity x occurrence x detection multiplied and gives a number that suggested which is risk is most important.

Example of FMEA application

Here will an in depth example of the FMEA be explained using an example with an airplane from a world wide airline.

Limitations

Critically reflect on the tool/concept/theory. When possible, substantiate your claims with literature

What the tool cannot do or where it meets its limitations

Discuss the importance of diversity in the team using the tool. How to get the most useful outcome based on limitations.

The weaknesses of the FMEA tool

Despite the advantages of FMEA, there are a number of weaknesses with the method: Bullet points:

• Multiple Failures: It is not possible to consider where multiple failures occur at once as there is no linking between failures.

• Time Consuming and people dependent: I might be very time consuming to list all potential failure modes and I relies heavily in the expertise of the people identifying them.

• Updates Required Frequently: Even with the best people and staff FMEA might miss some failure modes or new ones will be discovered as people gain experience and knowledge during the project development. This means frequent assessment ant updates.

• Underestimating Risk: If the people performing the analysis fails to consider a possible failure mode the associated risk might be underestimated.

• Potential Waste of Resources: Conversely, it might be that the analysis is to time consuming compared to what is gained from it and resources thereby are wasted.