A system composed of 100,000 lines of C++ is not be sneezed at, but we don't have that much trouble developing 100,000 lines of COBOL today. The real test of OOP will come when systems of 1 to 10 million lines of code are developed.
Yourdon (1990) cited in: Andreas Paepcke (1991) Object-oriented Programming Systems, Languages and Applications. p. 166.