With software systems such as operating systems, the interaction of their components becomes more complex. This interaction may limit reusability, adaptability, and make it difficult to validate the design and correctness of the system. As a result, re-engineering of these systems might be inevitable to meet future requirements. There is a general feeling that OOP promotes reuse and expandability by its very nature. This is a misconception as none of these issues is enforced. Rather, a software

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... system must be specifically designed for reuse, expandability, and adaptability [4] . Operating systems are dominated in many aspects. Supporting separation of concerns and aspectual decomposition in the design of operating systems provides a number of benefits such as reusability, expandability, adaptability and reconfigurability. However, such support is difficult to accomplish. Aspect-Oriented Programming (AOP) [7] is a paradigm proposal that aims at separating components and aspects from the early stages of the software life cycle, and combines them together at the implementation phase. Besides, Aspect-Oriented Programming promotes the separation of the different aspects of components in the system into their natural form. However, Aspect-Oriented software engineering can be supported well if there is an operating system, which is built based on an aspect-oriented design. Therefore aspects can be created in applications, reused and adapted from the aspects provided by the operating systems. Object-Oriented Operating Systems treat aspects, components, and layers as a two dimensional models, which is not a good design model. Aspects in the operating system cannot be captured in the design and implementation. Two-dimensional models lead to inflexibility, limit possibilities for reuse and adaptability, and make it hard to understand and modify. The poster will show an Aspect-Oriented Framework [1, 8], which simplifies system design by expressing its design at a higher level of abstraction, for supporting the design of adaptable operating systems. A framework is more than a class hierarchy and it is a reusable to produce custom systems and applications [5] . Aspect-Oriented Framework is based on a three-dimensional design that consists of components, aspects, and layers.