Great post from Craig Reid (aka Process Ninja) on why Continuous Improvement is needed:
If anyone is in doubt as to why improvement has to be continuous, the simple explanation is that stupid stuff happens all the time: mistakes are made, things are rushed, ideas badly conceived, ideas even more badly executed and then there are those people things - they keep making mistakes because for some unknown reason they aren't perfect. This doesn't even take into account the numerous amount of organisational activities that are going on on a daily basis that contribute absolutely nothing.
I think that pretty well covers it.
October 8, 2010