Metaprogramming can be achieved by three methods:

1. The executing program exposes its own source code to the runtime environment and appropriate changes are introduced in the program. The exposure can be through a direct link to the interpreter in the program or through well-defined external interfaces.
2. String expressions within the source code trigger certain metaprogramming procedures during runtime.
3. A general programming transform system applies commands specific to the programming language of the source code on invocation.

One advantage of computationally reflective systems is that the program is adaptable at run time. Any program statement can be changed at run time by means of the reflect statement. This system is far superior to method overriding, where the behavior is determined by the method being called at run time.