Critique of the OSI model
Too heavy - too many layers with overlapping functionality
Overly heavy and slow standardization process
The standards produced tend to be rather theoretical and rarely provide solution to real-life problems
The standardization of OSI protocols (such as X.400 and FTAM) and OSI profiles (such as GOSIP) has been a complete flop
The main function of the OSI model today is to server as a generic framework and terminology, not as a protocol family
The TCP/IP protocol suite has fullfilled all the promises made by OSI when it was conceived