In addition, the OSI protocols were specified by committees filled with differing and sometimes conflicting feature requests, leading to numerous optional features, because so much was optional, many vendors' implementations simply could not interoperate, negating the whole effort.
The OSI protocols were specified by committees. This was in addition. The OSI protocols were leading to numerous optional features, because so much was optional, many vendors'. This was in addition. Implementations simply could not interoperate optional, many vendors. These committees are filled with differing. These committees are filled with sometimes conflicting feature requests. Optional, many vendors were negating the whole effort.