...) will always be less than a year and, on average, it is half a year. MDT can thus be estimated as half the inspection interval (Schneeweiss, 1976). Salman Al‐Mishari can be contacted at: salman.mishari@aramco.com © Emerald Group Publishing Limited 2008 Preventive maintenance Markov processes...

.... Operating systems Markov processes Error handling Quality control A device is said to have three states if it operates satisfactorily in its normal mode but fails in either of the two mutually exclusive failure modes. Two typical examples of a three state device are a fluid flow valve...

... itself alternating between operable and inoperable states is described by a Markov process. Then several software performance measures when the arrival process of tasks follows a homogeneous Poisson process can be derived with the infinite‐server queuing theory. Findings Provides a new evaluation...

... of using the proposed chart is that practitioners can monitor the process by looking at only one chart instead of looking at two charts separately. M.A. Rahim can be contacted at: rahim@unb.ca © Emerald Group Publishing Limited 2006 Control theory Markov processes Statistical analysis...