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The original building blocks of software??”zeros and ones??”had quickly
become too small. What was needed was a programming language that offered
larger building blocks. And thus, development went on from assembler over
macro-assembler and C to eventually object-oriented programming languages. The
building blocks of which software is composed were no longer zeros and ones,
but classes and objects.
The rise of object-oriented programming languages began in the 1980s
with Smalltalk and particularly C   . The evolution of programming languages
appeared to have hit its limits when it had reached object orientation. The class
is the largest software building block still today. However, since the continued
progress in hardware required more and more complex systems, a new path has
emerged.
People had begun to graphically visualize software pretty early. In particular,
algorithms were documented and specifi ed in diagrams (e.g., the Nassi??“
Shneiderman diagram). This type of modeling intensifi ed at the beginning of the
145
1990s.


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