**How NCL is different**

NCL is a coherent and sufficient logic that engenders a new model of logically determined computation. It is coherent in that it consists entirely of functions with a common behavior mode: threshold functions with hysteresis behavior. It is sufficient in that it can realize a computation solely in terms of logical function relationships. Being fully logically determined, it happens not to need a time referent.

**Boolean Logic**

Boolean logic is coherent as far as it goes but it is not sufficient in that it cannot realize a computation solely in terms of Boolean logic but requires another form of expression, a time referent. Coordinating instantiated logic with the time referent is a complexity beyond the logic itself.

**Asynchronous methodologies**

Asynchronous design methodologies attempt to make the time referent very local (matched delay) or generate a local completeness relation in terms of logical relations (dual-rail) while retaining the basic computation model that inherently assumes a clock. NCL is not a method of replacing the clock or getting rid of the clock it is a model of computation that does not need a clock to begin with.

Two synthesis flows illustrate why asynchronous design has earned a reputation for costly complexity and why the reputation does not apply to NCL.

NCL is not a method of asynchronous design It is a model of logically determined computation which happens to behave so called asynchronously so we compare it to asynchronous design.

NCL is sufficient in itself to express all functional behaviors of a computing system.