Software development poses many kinds of requirements. Some are relatively simpler like converting an old (legacy) software into newer languages and making them parallel-ready, development of a UI and writing manuals etc. On the other hand, the customer may demand development of new software where Zeus starts from literature survey upto the development, validation, documentation and delivery of software.
Zeus also provides services for system design software where separate module for full design of a complete system is developed. The software takes care of the overall design issues. Study of overall system dynamics at one go gives the designer much more insight than results from individual analysis of sub-systems independently.