Abstract
We propose a new reflection model called2-dimensional hierarchical reflection. The model naturally describes reflective facilities which enable us to change the language semantics as well as the underlying environment, i.e., memory management and cpu scheduling. The concurrent object-oriented programming language called AL-1 has been designed based on the model. The language is an adaptable/extensible system in the sense that the system's bevavior is dynamically changed by the way of reflection. In order to demonstrate how the language is adapted in user's demand, the typical reflective programming in the language is presented.

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