We use a formal object-oriented specification language (OOL) to formalize and combine some UML models. With the formalization, we develop a set of refinement laws of UML models that captures the essential nature, principles, nature and patterns of object-oriented design. With the support

Modeling is a complex process which is quite hard to do in a structured and controlled way. Many companies provide a set of guidelines for model structure, naming conventions and other modeling rules. Using meta-models to describe these guidelines makes it possible to check whether an UML model

As the Unified Modeling Language (UML) and modeldriven development (MDD) become increasingly common in industry, many developers are faced with the difficult task of understanding how an existing UML model realizes system requirements. Essentially, developers are required to understand

The Unified Modelling Language (UML) is a standardised notation for describing object-oriented software designs. We present vUML, a tool that automatically verifies UML models. vUML verifies models where the behaviour of the objects is described using UML Statecharts diagrams. It supports

Software development evolution is a history of permanent seeks for raising the abstraction level to new limits overcoming new frontiers. Executable UML (xUML) comes this way as the expectation to achieve the next level in abstraction, offering the capability of deploying a xUML model in a variety

it is still difficult for software and system architects to integrate these techniques into their every day work. This is mainly due to the lack of methods that can be directly applied to architecture level models, for instance given as UML diagrams. Our approach bridges this gap and improves the integration

Abstract. This paper defines techniques for the slicing of UML models, that is, for the restriction of models to those parts which specify the properties of a subset of the elements within them. The purpose of this restriction is to produce a smaller model which permits more effective analysis

. The UML has been widely accepted as a standard for modeling software systems and is supported by a great number of CASE tools. However, UML tools often provide only little support for validating models early during the design stage. Also, there is generally no substantial support

this paper we present and compare some recently proposed approaches on the transformation of UML models of SAs into performance evaluation models. We aim at pointing out how the model transformation techniques make use of the UML diagrams

In this paper, both a UML model of requirement and a UML model of a design are defined as a pair of class diagram and a family of sequence diagrams. We then give an unified semantics for models of requirements and designs. We define the consistency between a design class diagram and the interaction