(PDF) Creswell_Qualitative_Inquiry_Resaerch_Design_Five ... Improved Visibility into COTS Software architecture and design includes several contributory factors such as Business strategy, quality attributes, human dynamics, design, and IT environment. Maintainability is defined by the ISO 9126 standard as "The ability to identify and fix a fault within a software component" (), and by the ISO/IEC 25010:2011 standard as "degree of effectiveness and efficiency with which a product or system can be modified by the . factors drive the evolution of a trend, and to what extent. Software maintainability is defined as the ease of maintaining software during the delivery of its releases. Viewed as a process, software design is the software engineering life cycle activity in which software requirements are . It can be described based on the . This involves not only using user rating but also counting intrinsic factors like code compatibility, maintainability, extension popularity etc. The factors that could directly influence the failure probability might include the following: Quality of the maintenance tools available . . Design is defined as both "the process of defining the architecture, components, interfaces, and other characteristics of a system or component" and "the result of [that] process" [1]. Maintainability is a design as well as maintenance property that can have a long-term effect on the reliability of SIS and I&CS. modularity, maintainability, reliability, readability, and scalability. -----Intrinsic factors in maintainabilty include which of the following? We've identified 11 such factors:6,7 Generality. Thus to achieve high availability, either the COTS software must be of high intrinsic reliability - probably a naive assumption - or there must be in place a strong vendor maintenance program (this assumption may be equally naive). The factors given in items 3 to 6 are acceptable, but an impact factor (the above dynamic magnification factor) should be included. Maintainability is a measure of the ease and rapidity of restoring a system or equipment to operational status following a failure or fault. Architecture. The Defense Acquisition Guidebook (DAG) Chapter 3-4.3.22, Supportability and Chapter 4-3.2.1.1 Sustainment Strategy provide a comprehensive discussion of Supportability Design objectives, to include: Logistics Infrastructure and Footprint Reduction. Care should be taken not to "over modularize" and trade-offs to evaluate replacement, transportation, and repair costs should be accomplished to determine the most . It is measured by the following ratio where MTBF means "mean time between failures" and MTTR means "mean time to repair" Intrinsic Availability = MTBF Such . part of the constraints that operate to the context of instructional delivery) (Smith and Ragan 2005). Access. Integration becomes much easier and improved intrinsic interoperability. In other - words, maintainability is the ease and speed with which a and maintainability of software systems from regular analysis of the source code. The contributions of this paper are three-fold: (1) We confirm and complements the findings by Anda [5], by extracting maintainability factors that are important from the software maintainer's . intrinsic factors, it is shown that there are significant association . The emphasis is to design new equipment with a high degree of reliability, at the lowest reasonable cost, that provides improved maintainability and ease of monitoring. The fluid transfer system for bonded marine hoses is dependent on floating offshore structures (FOS). Improved Visibility into COTS This paper presents an overview of different systems for sustainable fluid transfer and . The failure patterns that need to be considered may include an intrinsic failure rate, external environmental factors and dormant states. To this effect, we represent the evolution of a trend by a set of relevant factors, including time dependent and time independent factors, use them to collect factual data about historical trends, then use the data to derive some statistical observations. Avoiding special cases in the Therefore, in the RAMS / LCC paragraph, the IRIS requires RAMS / LCC process that is maintained continuously in order to ensure reliability, availability, maintainability and safety. This should include consideration of such factors as: Scrum Artefacts. View LOG 104 Module 1.docx from MGMT 101 at American InterContinental University. In terms of the quality perspectives distinguished by ISO/IEC 25010, the evaluation criteria include internal quality characteristics (i.e. Download : Download full-size image; Fig. Chapter 2: Software Design. Access. Leaflet 5 Contracting for Availability Page 2 Version 1.1 1. These models often include different measures and on their basis it is established a degree to . Unlike reliability, however, the instantaneous availability measure incorporates maintainability information. The DoD must include strict criteria for testing and quality. These features are intrinsic to the managed code that runs on the common language runtime. The intrinsic analysis is followed by support assessment. • Design of aircraft for maintainability. Product metrics describe the characteristics of the product such as size, complexity, design features, performance, and quality level. Page 1 of 44Activity 1.3As an information system developer, explain the following process activities to your coworkers: specification, development, validation and evolutionSpecification: Software specification or requirements engineering is the process of understandingand defining what services are required from the system and identifying the constraints on thesystem's operation and . This involves not only using user rating but also counting intrinsic factors like code compatibility, maintainability, extension popularity etc. Testabilit y Accessibili ty Modularit y 11) DoDD 5000.01 states that the Program Manager (PM) shall develop and implement Performance-Based Product Support strategies that optimize total system availability while . Intrinsic factors Intrinsic factors are those we can use to de-scribe programming languages' general design criteria. Due to the demand for oil production in varying water depth regions, the advantage of flexible buoyant conduits has led to an increase in bonded marine hoses for fluid transfer and (un)loading operations. Thus to achieve high availability, either the COTS software must be of high intrinsic reliability - probably a naive assumption - or there must be in place a strong vendor maintenance program (this assumption may be equally naive). The purpose of this appendix on the qualitative factors assessment methodology is to provide guidance and best practices for use in estimating intrinsic costs and benefits (i.e., qualitative factors) to improve the clarity, transparency, and consistency of the U.S. Nuclear Regulatory concerning intrinsic properties), but exclude external quality characteristics (i.e. . ones: for instance, maintainability costs depend on different factors like number of errors or designer expertise and so on, while the model size is evaluated simply counting lines of instruction code. factors from instructional delivery factors (which include learning context, student characteristics and instructional management characteristics) (Lee and Owens 2001). Reliability & Maintainability (R&M) Engineering Overview. Introduction. Aspects of maintainability and how much outage time is necessary for recovery, or whether specialities and qualified people are necessary, that may be in short supply. Generally speaking, in practice it is found that about Omissions following interruptions - we rejoin a sequence of actions having omitted certain required steps . 2 pages. The purpose of Reliability and Maintainability (R&M) engineering (Maintainability includes Built-In-Test (BIT)) is to influence system design in order to increase mission capability and availability and decrease logistics burden and cost over a system's life cycle. LOG 104 Module 6 Exam Risk Reduction through Test and Evaluation.docx. of the development procedure. Care should be taken not to over modularize, and trade-offs to evaluate replacement, transportation, and repair costs should be accomplished to determine the . The evaluation may also be performed by assigning to each maintainability criterion, a numerical value between 0 and 1 using a table, like the one listed in Table 1 [3]. b.If the firm's revenues are $50,000, how much should . This framework has afforded a roadmap for analyzing the system quality that can illustrate some EA attributes in the application layer and also includes the following attributes: security . Steps for performing maintainability demonstrations and evaluating the results and guidelines to avoid pitfalls in maintainability . Some of these parameters are visible to the users who are working with the software and some of them are intrinsic to the code. pendent variables include the intrinsic factors. In order, to identify them, you need to analyze the product's performance and make it convenient and useful. the process refers to the intrinsic characteristics of a software product, has several elements which include functional suitability, reliability, performance efficiency, Maintainability, security, compatibility, Portability And Quality in use, There are several relative characteristics that are viewed from the The more frequent causes of unreliability are 3 equipment complexity, incorrect rating of components, intrinsic inability to meet operating conditions, component unreliability, manufacturing errors and poor maintainability. Alternatively, costs can be considered as a learning context factor (i.e. The emphasis is to design new equipment with a high degree of reliability, at the lowest reasonable cost, thereby, achieving improved maintainability and ease of monitoring. In 2011, we expect intrinsic factor IF to be more important than intrinsic factor IF′ in ensuring success with respect to extrinsic factor EF. variables include age, gender, occupation, and education, if are . It shows that machine independence, extensibility and generality have more impact to this extrinsic factor than other intrinsic factors. The MTTR should also include factors . Maintainability is the ability of a system to be maintained or restored to a specific operating condition, when maintenance is performed by personnel with the required skills and using prescribed procedures and material resources (Military HandBook 470A 1997 ). To this effect, we represent the evolution of a trend by a set of relevant factors, including time dependent and time independent factors, use them to collect factual data about historical trends, then use the data to derive some statistical observations. Safety-Maintainability-Reliability Interface • Mark the following guidelines in the diagram: - Direct removal and replacement of faulty components, or their repair by personnel - Switching to redundant equipment through the use of built-in, self-checking circuits - Use of redundant elements and use of majority voting Intrinsic factors contributing to maintainability are: [1] Modularity: Packaging of components such that they can be repaired via remove and replace action vs. on-board repair. The COR needs to include the following in such a notification: . A firm faces a price elasticity of e =-2 and an advertising elasticity of e^A=0.1. Note: The information below is provided as an overview of Availability, Reliability and Maintainability and .. . measure intrinsic attributes of the software systems . True. 7. Maintainability and Safety (RAMS) together are the basis for LCC. With regards to security, managed components are awarded varying degrees of trust, depending on a number of factors that include their origin (such as the Internet, enterprise network, or local computer). log 104 2.pdf. concerning behaviour in a test environment) or quality-in-use characteristics (i.e. An HSbM is employed to rectify the failure state of a system caused by external environmental factors whereas an RbM action is responsible for the failure caused by intrinsic factors. • The importance of intrinsic factor IF with respect to the success criterion defined by extrinsic EF increases from 2003 to 2011. maintainability problem and a frequent cause of ineffec-tive maintenance. Evaluation Criteria Trusted Product Maintainability - Public 7 / 16 Volume: The overall size of the source code of the software product. 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