Zenbara (also called teardown) means 'dismantling'. It is the
principle of taking a product to pieces, bit by bit and examining each
part in great detail.
It is useful for several situations:
It is during the research and development phase and dismantling a
product that has been used for some time will show how it is wearing,
developing hot spots, etc.
During manufacturing, samples may be taken apart to check that they
have been assembled exactly right.
A product has failed unexpectedly and requires careful analysis to
find the failure and its root cause.
A competitor has produced a strong product. Zenbara leads to
understanding of how they did it and uncovers the underlying design
and principles which, when understood, can be imitated and improved