Information Systems (IS) are increasingly becoming regarded as crucial to an organization's success. Information Systems Development Methodologies (ISDMs) are used by organizations to structure the information system development process. ISDMs are essential for structuring project participants’ thinking and actions; therefore ISDMs play an important role to achieve successful projects. There are different ISDMs and no methodology can claim that it can be applied to any organization. The problem facing decision makers is how to select an appropriate development methodology that may increase the probability of system success. This paper takes this issue into account when study ISDMs and provides a Rule-based Expert System as a tool for selecting appropriate ISDMs. The proposed expert system consists of three main phases to automate the process of selecting ISDMs.Three approaches were used to test the proposed expert system. Face validation through six professors and six IS professionals, predictive validation through twenty four experts and blind validation through nine employees working in IT field.The results show that the proposed system was found to be run without any errors, offered a friendly user interface and its suggestions matching user expectations with 95.8%. It also can help project managers, systems' engineers, systems' developers, consultants, and planners in the process of selecting the suitable ISDM. Finally, the results show that the proposed Rule-based Expert System can facilities the selection process especially for new users and non-specialist in Information System field

One of the most important reasons for information systems failure is lack of quality. Information Systems Quality (ISQ) evaluation is important to prevent the lack of quality. ISQ evaluation is one of the most important Multi-Criteria Decision Making (MCDM) problems. The concept of Single Valued Triangular Neutrosophic Numbers (SVTrN-numbers) is a generalization of fuzzy set and intuitionistic fuzzy set that make it is the best fit in representing indeterminacy and uncertainty in MCDM. This paper aims to introduce an ISQ evaluation model based on SVTrN-numbers with introducing two types of evaluating and ranking methods. The results indicated that the proposed model can handle ill-known quantities in evaluating ISQ. Also by analyzing and comparing results of ranking methods, the results indicated that each method has its own advantage that make the proposed model introduces more than one option for evaluating and ranking ISQ.

Purpose. In recent years in Egypt there has been a significant increase in the demand for building materials, particularly gravel which is employed in buildings, the base layer for road construction, and other industries. The quality of gravel that is deemed suitable for different purposes depends on the physical, chemical, and mechanical properties of the gravel; these aspects are determined according to the Egyptian Code, depending on the required application. Methods. Representative samples were collected from two working sides of the quarries, then they were processed in a laboratory to characterize the samples depending on the location and evaluate their properties with respect to the corresponding concrete and road codes. Findings. The findings indicate that the gravel tests were simple to conduct and that the gravel from these locations were suitable for constructed roads and to be used in mixture of asphalt and cement. Originality. The samples were collected from five quarries around the Qena Governorate, Egypt; each of these locations occupied areas ranging from approximately 100×100 or 200×100 m2. Practical implications. The loss of gravel at the studied quarries was found to be 32.88-44.06%. Abo-Teshet 1 exhibited the highest loss of gravel deposits with thicknesses ranging from 0.5 to 1.50 m, which was attributed to the fill layers.

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