Everything can and should be improved; improvement opportunities should be constantly explored.
The three important concepts of Kaizen ,Kaikaku and Kakushin - all relate to process improvements, based on Toyota Production System.
Kaizan promotes incremental continual improvement, resulting in delivery of products and services quicker, while reducing cost and without compromising quality. This is basically done by eliminating non value added work in the processes, thereby increasing efficiency, productivity or performance. Taking the example of glazing in construction industry, the actual improvement of work processes by reducing the non value added activities involved can improve the speed and efficiency of the work
While Kaizan is evolutionary, focused on incremental improvements, Kaikaku is revolutionary and focused on radical improvements. Kaikaku is a breakthrough, rapid and radical improvement of any activity. Kaikaku can be applied to the above example of glazing works by changing the glazing material to light weight variants available. This will result in quicker execution along with the kaizan improvements applied.
Thus Kaizan can bring about small incremental changes and Kaikaku can bring about big revolutionary changes to the existing production processes, but in certain circumstances, new and revolutionary ideas are needed. Kakushin comes into picture here; it deals with innovation, transformation, reform and renewal. The glazing material, by applying Kakushin, can be revolutionized by introducing photovoltaic glazing which help buildings generate their own electricity.
Kakushin and Kaikaku is sought in addition to Kaizen, not in place of Kaizen and are sometimes used as a precursor to Kaizen activities. Kaizen is essential for a long-term.
Effectively applying these three concepts can enable any organization to deliver a high quality product or service.