All entries for Tuesday 24 March 2009

March 24, 2009

Understanding system

Again another interesting day for RDD. Today we studied Markov model, reliability Block diagram RBD, and Petri net

I feel even with the simple examples we used in class today, we can begin to feel the power of these tools in helping us to unravel and understand the working of a complex system

reliability block diagram , markov model and Petri net seem to be an extension of the Fault tree analysis from yesterday but focusing on the series of intermediate events that happens between an operating system and a failed system. This is represented by the RBD. Markov model represent the system as different states and add statistical probability to system being in each state as well as the transition between different states. And lastly the Petri net tells us about the sequence of event leading to a systemic failure.

Today's session fit well well with the CBE especially in Deming's first theory of profound knowledge - appreciation for the system. Until now the system idea has been a rather fuzzy concept, we know it's important and very influencial but we don't fully understand how to change or improve it. Studing this RDD module put the concept of system in a better perspective. It allows use to see why an big event is usually a working consequence of many other smaller sub events (or subsystems). Vice versa, how smaller seemingly insignificant and discrete decisions can lead to a much bigger often unintended consequence. Although we study this in an enginering context, it isn't difficult to see how it can be applied to other scenarios or disciplines. Most importantly, it at least give us some idea about how to go about modifying the system for business improvement.


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