Modernization Of Legacy Systems Research Articles

A Multi-Criteria Decision-Making for Legacy System Modernization With FUCOM-WSM Approach

A Multi-Criteria Decision-Making for Legacy System Modernization With FUCOM-WSM Approach

We need a theoretical framework for the modernization of industrial legacy systems

We need a theoretical framework for the modernization of industrial legacy systems

CMMI Compliant Modernization Framework to Transform Legacy Systems

Legacy systems deteriorate due to changing business practices and recurrent problems such as high maintenance cost, lack of agility, and degraded performance. Modernization is highly desired especially for those organizations where key business processes are managed by legacy systems. During modernizing, two important aspects are usually ignored, i.e., the transformation of a legacy system to an enterprise solution, and considerations of quality concerns. This overlooking leads to a modernized information system that partially achieves the expected outcome. In this paper, we propose a Capability Maturity Model Integration (CMMI) Compliant Modernization Framework (CCMF) that addresses the problems of legacy systems by modernizing to an enterprise system in order to meet the expectations of stakeholders. CCMF is compatible with CMMI Level 2, which is a world-renowned software process improvement standard. Our proposed framework consists of eight distinct stages containing best practices with expected outcomes that are compliant with the specific goals of CMMI Level 2. The framework is based on various strategies that ensure the seamless modernization of legacy systems. Our contributions are twofold. First, it supports the modernization of outdated legacy systems to a more reliable enterprise solution. Second, it is compliant to CMMI standard with due consideration of quality and reliability concerns of the evolved modernized systems. The usability, scalability, and usefulness of the framework are validated by expert judgment on an industrial case study. Our proposed framework is also applicable for change-resistant companies with monolithic systems.

A Guidance to Legacy Systems Modernization

Rapid development of information technology and communication (ICT) has increased the use of information systems in organizations since a decade ago. At the same time, many organizations are still using old information systems to support their business, known as legacy systems. Even though these systems cause technical problems, but they are still used to support service delivery to the customer. These systems are also essential to organizations as they have been operated for many years and possess high business value. The operation of legacy systems cannot be stopped quickly, as it will affect daily business tasks. However, organizations with legacy systems need to think about the ability of the systems to support their future direction. Modernization of legacy systems needs to be implemented to ensure the systems are aligned with global changes as well as improving the competitiveness of the organizations. This study, therefore, reviewed the phases and factors involved in legacy systems modernization to identify gaps and their insufficiencies. There are many studies on legacy systems, but only a few have focused on the overall process of legacy systems modernization. Most studies on legacy systems are technical in nature and refer to specific aspects and phases of modernization. This study aims to provide overall guidance to the organizations in performing legacy systems modernization.

Extracting models from source code in software modernization

Model-driven software modernization is a discipline in which model-driven development (MDD) techniques are used in the modernization of legacy systems. When existing software artifacts are evolved, they must be transformed into models to apply MDD techniques such as model transformations. Since most modernization scenarios (e.g., application migration) involve dealing with code in general-purpose programming languages (GPL), the extraction of models from GPL code is an essential task in a model-based modernization process. This activity could be performed by tools to bridge grammarware and MDD technical spaces, which is normally carried out by dedicated parsers. Grammar-to-Model Transformation Language (Gra2MoL) is a domain-specific language (DSL) tailored to the extraction of models from GPL code. This DSL is actually a text-to-model transformation language which can be applied to any code conforming to a grammar. Gra2MoL aims to reduce the effort needed to implement grammarware-MDD bridges, since building dedicated parsers is a complex and time-consuming task. Like ATL and RubyTL languages, Gra2MoL incorporates the binding concept needed to write mappings between grammar elements and metamodel elements in a simple declarative style. The language also provides a powerful query language which eases the retrieval of scattered information in syntax trees. Moreover, it incorporates extensibility and grammar reuse mechanisms. This paper describes Gra2MoL in detail and includes a case study based on the application of the language in the extraction of models from Delphi code.

Bottom-up and top-down COBOL system migration to Web Services: An experience report

Moving from mainframe systems to a service-oriented architecture (SOA) using Web services is an attractive but daunting task. The bottom-up or direct-migration approach enables the effective modernization of legacy systems to Web services. Conversely, bringing migration into fruition with the top-down or indirect-migration approach is more difficult, but it achieves better migration results. Employing both approaches on the same large enterprise system is uncommon, which leaves no room for comparison. This article describes the migration processes, costs, and outcomes of applying both approaches on a real Cobol system.