Understanding Markov Calculations

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Windchill Markov computes an extensive set of reliability related values. A sampling of supported calculations is outlined below and brief descriptions are provided. For more information about these calculations, see the help or guide for Windchill Risk and Reliability.

Calculation	Description
Availability	The probability that a system is operating properly at a specific time point. Availability is a time-based probability value, so it is always a value between 0 and 1. It is a function of both reliability (how quickly a system fails) and of maintainability (how quickly the system can be repaired).
Capacity	The average throughput, profit, or reward of the system per unit time at a specified point in time.
MTBF	The MTBF (mean time between failures) represents the number of hours a unit operates between failures.
Mean time to first failure (MTTFF)	The average time until the first failure of the system. Frequently, MTTFF is simply called MTTF.
Reliability	The probability that a system remains operational until a specified time. Reliability is a time-based probability value, so it is always a value between 0 and 1. A reliability of 0 means that a system is infinitely unreliable, or never functioning. A reliability value of 1 indicates that a system is infinitely reliable, or always operating.
Unavailability	The probability that, at a given time, the system would not function, due to either a failure or a repair.
Unreliability	The probability that a failure would occur during a given time period.