A note on “! on &”: This often symbolizes an end product having many variants and therefore addresses the T structure mentioned above. In the lower structure levels, semifinished items are put together as modules. In assembly, many variants of end products are built from the semifinished goods or subassemblies. This is the case with automobiles. But because final assembly is clearly based upon an assembly -oriented, convergent product structure, it should not be represented by the upside-down triangle. It is not the case that several products will arise from a particular semi-processed item. Although the symbol is used quite commonly in this case, it is used incorrectly. A separate feature for describing the variant structure is — as mentioned before — the product variety concept. See below.