Assessment of reliability in the early stages of software development from architectural models is one of the major challenges that many studies have addressed in this field in the last decade. The main drawbacks of existing methods are the following: 1) considering equal impact for all parts of the software architecture on system reliability, and 2) inability to determine the contribution of each part of the software in the system failure. This paper introduces the extended version of the colored petri net as an underlying verifiable model to evaluate the reliability of a software system. The proposed model enhances reliability assessment of the software system by measuring the density of failure for each part of the software system, predicting the reliability during execution of a scenario, and estimating the reliability of every structural part of a program, such as loops and conditions. These innovations enable software architects to cost-effectively identify and correct the vulnerable parts of a system in the early stages of software development. The high-level model of the scenario is taken as a UML sequence diagram. Synthesis of the formal model is conducted using an introduced graph called a fragments dependency graph. The practicality of the suggested approach is illustrated by a case study.

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Web-based application development is a difficult task, since these applications include various features, like graphical interfaces, navigational structures, business models, and wireless communications, as well as other issues, such as serving a multitude of users, and the need for shorter development time. To overcome these complexities, it is indispensable to use web-based application designs and software architectures. In this paper, we use a multi-tiered, component based software architecture based on the J2EE technology. This technology separates the different parts of a complex application, and the development time is reduced through the use of components and distributed structure. Unfortunately, the J2EE technology lacks rich hypermedia and navigational structures, and the mapping of prepared designs to components is not carried out properly. For this reason, in this article, a combined architecture called OOHDM-J2EE is defined which uses the benefits of both schemes and solves the mentioned problems, provides the possibility of reuse, and further reduces the development time.

Web-based application development is a difficult task, since these applications include various features, like graphical interfaces, navigational structures, business models, and wireless communications, as well as other issues, such as serving a multitude of users, and the need for shorter development time. To overcome these complexities, it is indispensable to use web-based application designs and software architectures. In this paper, we use a multi-tiered, component based software architecture based on the J2EE technology. This technology separates the different parts of a complex application, and the development time is reduced through the use of components and distributed structure. Unfortunately, the J2EE technology lacks rich hypermedia and navigational structures, and the mapping of prepared designs to components is not carried out properly. For this reason, in this article, a combined architecture called OOHDM-J2EE is defined which uses the benefits of both schemes and solves the mentioned problems, provides the possibility of reuse, and further reduces the development time.