*Note 3: In case the target objective (top level) is broken down into too many subordinate concepts (see NG2 in
Fig.3-6), it is likely that the top level description is too complex and detailed. Detailed description
should be left to lower levels. Take microscope observation as an example. The magnification factor in
the first layer (directly below the target objective) should be low (say, x5) and increase stepwise in
lower layers (x100 in the second layer, x400 in the third layer, and so on).