Description of the Types of Tree Analysis - Paper Example

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Boston College
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Question 1: Description of the Types of Tree Analysis

The three possible tree analysis are Fault tree analysis, decision tree, and Event tree analysis. In some instances, tree analysis can be grouped into fault tree, negative tree, positive tree or analytic or developed tree (Qakley, 2012). Event tree analysis follows a forward, bottom up, a logical modeling technique that measures both the failures and success of the experiment. It also lays the path for assessing the outcomes probabilities for the overall system. Fault tree analysis is said to be a top-down and deductive failure analysis which analyzes the undesired State of a system in the application of Boolean logic. They are used to determine failure rates and system failures. Fault tree analysis is applicable in reliability engineering and safety engineering to understand if a system can fail. The third one is decision tree which helps in choosing the best course of action from a variety of activities (Qakley, 2012). Decision tools offer a range of structures to investigating possible outcomes and helps in balancing a picture of rewards and risks.

Question 2: The Three Types of Cause and Effect Analysis

They are Apollo Method, the five ways, and Fishbone. The Apollo method is a software that needs a minimum of two causes (Qakley, 2012). On the other hand, the 5 Whys is usually used to obtain a beyond symptoms and in finding the real reason or cause of the accident in question. In this particular scenario, I will use the Fishbone diagrams to determine why the forklift injured the worker. It will be easier to use the Fishbone diagrams for this type of accident since it concentrates on finding the possible causes and grouping them into the required categories. For that case, it will be easier to figure out the reason why the driver of the forklift did not see the worker and if the worker was too close to the forklift (Qakley, 2012).

Question 3: Explanation of The Three Types of Fault Tree Process

Fault tree analysis is used in determining the factors that are connected to fault processes and which lead to a particular event (Qakley, 2012). The first type of fault tree analysis is the onset of the primary function or accident. The second one is to find the event that caused or led to the central event or logic gates, outputs or inputs faults which correspond to the event. The third step is making the process to continue by developing casual factors until the time a correctable event is reached (Qakley, 2012). After finding the root cause of the event, controls are designed to help correct all the casual factors that led to the chain of events which led to the accident.

Question 4: The Problems Associated with effect and cause analysis

Regarding Oakleys (2012) research, the problems that are associated with impact and because the study is that an accident investigation uses several types of effect and case analysis. In most cases, investigators skip some cause of the problem under review and do not look at the issue of training, management, policies or any other factors. Regarding Qakleys (2012) research on safety in engineering, the other problem is that do not follow any analysis through the process hence messing with the causal factors and the corrective actions thus ending up with an uncorrected root cause.


Qakley, J.S. (2012). Accident investigation techniques: The basic theories, analytical methods and applications (2nd Ed.). Des Plains: American Society of Safety Engineers.

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