However, the functional implementation below the open standard specification line differs between platforms.
The implementation of threads and processes differs from one operating system to another, but in most cases, a thread is contained inside a process.
Usually asymptotic estimates are used because different implementations of the same algorithm may differ in efficiency.
The implementation of within a kernel often differs significantly from the implementations used by C libraries, however.
The implementation of the algorithm from a mass spectrometry software to another differs.
Often two implementations will differ in the speed of each operation, but neither will be faster than the other for all operations.
Though the projects' implementations of such features often differ.
The implementation of ABC differs among those who use it.
However, their implementation may differ according to time, place and circumstances.
Note that the implementation of the date command differs between Unix flavors (see references below).