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The aim of this paper is to specify formally the Relational Model of Data. This specification could be extended to cover Object-Relational Model of Data and Data Streams. 1. Introduction. In this paper, a Relational Model of Data (RMD) is specified following its original presentation given in [1]. Z-notation is used as formal notation. It is now an international standard [2]. The original prese...

Formal methods are mathematical techniques use in design, development and verification of software and hardware system. Geographic information systems GIS use to collect, store, analyze and present spatial informations. GIS databases are usually very complex to design. Formal methods can play an important role in their design. In the paper, the authors investigate an approach of formal specific...

Formal modeling techniques can be used to define and verify software architectures precisely. This paper applies the recently developed integrated formal specification techniques, Timed Communicating Object Z (TCOZ), to the generic software architecture modeling and verification.

A Mobile Ad hoc Network is a network of mobile nodes operating in an infrastructure-less network. These nodes not have the defense rendered by firewalls in infrastructure-based networks. Trust oriented system aids to improvise this situation. So, the incorporation of trust in routing decisions yields a more secure and reliable framework for such type of networks. As if any suggested model does ...

A formal specification is beyond the comprehension of the average software customer. As a result, the customer cannot provide useful feedback regarding its correctness and completeness. To address this problem, we suggest the formalism expert to work with the customer to create precise scenarios. A precise scenario describes an operation by its effects on the system state with only a few simple...

Object-Z and CSP are high level specification languages which offer powerful formal support for the design of distributed, communicating systems. Java is an ideal implementation language for such systems. But developing provably correct Java implementations from these specifications is notoriously difficult. To bridge this gap we suggest to use Jass, which extends Java with assertions, as an in...

Specification of system requirements is often involved with ambiguity and nondeterminism. Formal methods tend to mitigate ambiguity but nondeterminism remains as an inherent part of specification. This is due to the abstraction from real world details that causes a formal specification to define several results as a correct solution to a problem. Hence, a support for nondeterminism should be fo...

This article describes an empirical study where use cases and class diagrams (semi-formal modeling) and Z language (formal modeling) were used to make a requirements specification of an information system. The study presents some benefits of formal modeling for the quality improvement during the requirements specification of an information system. The empirical study was developed based on a re...