January 22, 2008

Two key factors of Variation

The common causes and special causes arose my interest on them...

i always thought the common causes could be predicted. coz people know the what and where and when could happen if estimate the process with sound experience....like people know it could be roadblock at rush hour from monday to friday. and they cant predict if there would be a terriable jam...

actually, i m still confused.....

and the common causes could become the specical causes without performing good control on common causes...although the special causes usually transient, it could be vital to the whole process.

if these causes need improvment activities. which would be conducted as normal continuous improvement and which would be conducted as breakthrough?


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