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The following articles focus on the basic theories behind dependability and concepts closely related to it. The complete articles can be found either under the links on each of the representation sections below or straight from the list structure on the left side of the web page.

Dependability, Availability, Reliability

Dependability describes the ability of the object to perform a desired function or operation in certain environment on a planned time period. The concept of dependability can be divided ...

Risk Analysis and Risk Management

Risk Analysis aims to recognize threats and failures, the probability of their occurrence and possible consequences coming from them. Risk analysis is carried out by utilizing all the available system data in order to understand the significance of the risk and to find ways to control it.

Fault Tree Analysis

Fault Tree Analysis (FTA) is a deductive method for finding out the causes of an unwanted event. The method includes creating a structured graphical model of the factors leading to the unwanted event. The graphical presentation uses named nodes to describe the events, and the relations between the nodes are defined with links and logical gate inputs.

Cause-Consequence Analysis

Cause-Consequence Analysis (CCA) is used for analyzing the product or system through cause-consequence relations. It can help locating the system failures or preventing possible errors before they even cause any problems.

Reliability Block Diagram

Reliability Block Diagram (RBD) shows the reliability technical connections between the relevant product or system components and functions in a graphical form. Reliability block diagrams can easily be created based on flow charts, structural drawings or process and instrumentation drawings.


Simulation stands for imitating the operation of a real life system with the help of a computer. First a mathematical model (fault tree/event network) is created from the system which describes the real life system to the computer as clearly as possible ...

Failure Mode and Effects Analysis

Failure Mode and Effects Analysis (FMEA) can be defined as a group of actions that are meant to locate the possible failure patterns of a product or a process, and to estimate the consequences of these failures. In addition the aim of FMEA is to find out the methods that can be used to prevent the failures from happening or at least to reduce the probability for them to occur.

Reliability-centered Maintenance

Reliability-centered Maintenance (RCM) is a method for creating preventive maintenance schedule to enable the equipment and structures to reach the required safety and availability levels. The aim of RCM is to improve safety, availability and finances in everyday operations.

Life Cycle Costs

Life Cycle Costs (LCC) stands for all the combined costs that the object will face or can be assumed to face during its defined life cycle ...