Thus, good modularity and abstraction leading to easy maintenance and extensibility are achieved. Forth is a simple, yet extensible language; its modularity and extensibility permit writing significant programs. This is claimed to increase the "modularity" of the application and hence its maintainability. This has advantages for modularity, compatibility, and flexibility in system configuration. These methods provide an abstraction layer that facilitates encapsulation and modularity. Different models provide tradeoffs of concepts such as compositionality, modularity, and locality. It involves analysis of the structure, modularity, usability, reliability, efficiency, & achievement of goals. Xfce embodies the traditional Unix philosophy of modularity and re-usability. The Pyra design aims for modularity and openness in software and hardware alike. Sigma stands for Ship Integrated Geometrical Modularity Approach. It is also because the modularity of the Unix kernel is extensively scalable. It is designed for clients who require modularity and scalable performance. The synthesizer also introduced fundamental synthesizer concepts such as modularity and envelope generation. This method eases modularity and nomadic computing. Other perspectives on modularity come from evolutionary psychology.