Kaikaku is a Japanese word for 'radical change' that means complete upgrade or replacement of a system or process.
«change my mind»
Using Kaikaku is like setting off a bomb in the workplace. It is dangerous and revolutionary. It breaks existing paradigms and throws out old ways of thinking. Kaikaku is taking a sledgehammer to a system/process. Due to the large nature and ergo expensive nature of these changes they are normally top-down decisions. Also, Kaikaku tends to be done at a larger scale.