This maintainability index mi has evolved into numerous variants and has been successfully applied to a number of. Survey has been conducted to recognize challenges and practices in maintainability of prototypes. Comparative study of the factors that affect maintainability soumi ghosh, sanjay kumar dubey, prof. Moreover we sped up grain unloading, developed a thresher for wheat, and improved maintainability. Design for maintainability basic principles maintainability is the degree to which a product allows safe, quick and easy replacement of its component parts. Stanag4174 allied reliability and maintainability publications. Maintainability index is a software metric which measures how maintainable easy to support and change the source code is. For sideband radiation at least 48 db antenna ring of adequate size to produce a modulation index of 16 1 have to be provided. Code metrics maintainability index the ultimate visual. This document is a first step towards the construction of a maintainability prediction model.
Implementing source code metrics for software quality analysis written by mandeep k. The use of building survey for maintenance of building in. The corporation dvds topical paradise dvd 2 this is a list of all of the extra footage organized by topic so you can select the clips that interest you most. Maintainability is the ease with which a software product can be modified. Pdf evaluation of maintainability index of a mechanical. Prepared by the office of the secretary of defense in. Pdf a practical model for measuring maintainability researchgate. Changes which do not conform to these documents are a change in configuration. Unreferenced requirements the number of requirements not referenced by a lower document. So, as an example, if the url of a request equals videosindex, it should be handled by a controller called videoscontroller with the index method or action. The truth behind misalignment vibration spectra of rotating machinery s. Broadly recognized as an effective part of preservation planning, a historic structures report also addressed management or owner goals for the use and reuse of the structure.
Many other discipline areas such as health and safety, medical, reliability, maintainability, quality assurance, it, security, logistics, and environmental perform functions during project lifecycle phases that influence or are influenced by the engineering functions performed and need to be fully integrated with the engineering functions. Hartung spectraquest, inc 8205 hermitage road richmond, va 23228 804 26300 email. While maintainability is important as a factor of availability, it also merits substantial consideration as an individual system characteristic. Reliability, maintainability, and availability rma analysis for the ecs project white paper february 2002 prepared under contract nas560000 responsible author william wyman s 21102 william wyman, ils manager date eosdis core system project responsible office valecia maclin s 21102 valecia maclin, director systems engineering date. The first model is the wellknown maintainability index mi oman and hagemeister. Regional atmospheric modeling system, or rams, a collection of atmospheric simulation, data analysis, and visualization software.
Reliability, availability, maintainability ram study, on. Although treated as separate elements, preventivepredictive maintenance, reliability engineering, equipment history and functional pride and quality assurance are inextricably supportiveeach to the others. The truth behind misalignment vibration spectra of rotating. Why dont you consider unit testing coverage to be a part of the maintability index. The software maintainability index revisited kurt d. Pdf maintainability and flexibility at the software level are of predominant importance to drive innovation at the business process level. Reliability, availability, maintainability, and cost rationale report manual.
However, existing definitions of maintainability, such as the halstead volume, mccabes cyclomatic complexity or the sei maintainability index provide a very poor understanding of what maintainability is how it. The maintainability index was introduced at the international conference on software maintenance in 1992. Automated discovery of workflow models from hospital data. Important software test metrics and measurements explained. Chawla, indu chhabra published on 20120802 download full article with reference data and citations. We have shown the possibility to achieve better quality attributes given to a certain system. However, it is a good indicator of the e ort required to change. Color coded ratings can be used to quickly identify trouble spots in your code. Quality assurance california state university, dominguez hills.
Implementing source code metrics for software quality. Measuring software maintainability semantic scholar. Rams, an acronym for reliability, availability, maintainability and safety. Maintainability index mi estimation calculation is one of the wellknown. Ships configuration is defined by drawings and drawing revisions specified in the ships drawing index and by equipment technical manuals applicable to equipment installed in the ship in accordance with these drawings. To satisfy customer demands, we developed a unique layout that makes the machine compact and improve operability. Technical specifications for the pdf free download.
Chapter 3 maintainability introduction maintainability and reliability are the two major system characteristics that combine to form the commonly used effectiveness index availability. Comparative study of the factors that affect maintainability. The maintainability index mi metric was proposed in the early nineties to gauge ease of code maintenance. Issue 072014 i etech 3 even if the packaging of the brandnew device you just acquired indicates that it was made in a specific country, you can be assured that it isnt quite the whole picture.
Revisiting the maintainability index metric from an objectoriented. Maintainability maintenance is the activity of modifying a software product after initial delivery. A historic building report provides documentary graphic and physical information about a structures history and existing condition. Other readers will always be interested in your opinion of the books youve read. Mission objectives include safety, mission success and sustainability criteria. Mccabes cyclomatic complexity or the sei maintainability index provide a. Success of the preventivepredictive maintenance program is dependent upon the existence of the other three elements. A method can be complex but as long as there are unit tests for it, it is much simpler to maintain. Mi is a composite metric that incorpo rates a number of traditional source code metrics into a single number that indicates relative.
Maintainability is a requirement of the cei and swci specifications. How to effectively define and measure maintainability. Document functions arguments, return values, side effects, exceptions raised. The maintainability index is calculated as a factored formula consisting of lines of code, cyclomatic complexity and halstead volume. This is a quick note about the maintainability index, a metric aimed at assessing software maintainability, as i recently run into developers and researchers who are still using it. A column of eight topics appears on the left side of the screen. A metric is computed on the software products with the intent to predict maintainability indicators. Methods and techniques, volume 1, reliability, availability. On the other hand, the maintainability index has been proposed to calculate a single number that expresses the maintainability of a system. Methods and techniques, volume 1, reliability, availability, maintainability and safety assessment villemeur, alain on.
Project code meter halstead complexity measures article cited from wikipedia halstead complexity measures are software metrics introduced by maurice howard halstead in 1977. Maintainability represents thus an important parameter in the optimization of availability and lifecycle cost. Pdf maintainability indices for public building design. In this context, ram factors constitute a strategic approach for integrating reliability, availability and maintainability, by using methods, tools and engineering techniques such as mean time to failure, equipment down time and system availability values to identify and quantify equipment and system failures that prevent the achievement of. Think twice before using the maintainability index. Maintainability is a measure of the ease with which a software system can be. A core part of the eia is the cumulative impact assessment cia where the developments impacts combined with those impacts from other foreseeable projects are assessed. Maintainability indices for public building design article pdf available in journal of building appraisal 44. The quality of the match between the theoretical distribution and the empirical data was. Maintainability index calculates an index value between 0 and 100 that represents the relative ease of maintaining the code.
Yes commercial tool available and no manual computation required. Performance, maintainability and implementation cost for. An indicator is a measure of maintainability based on historical maintenance data. The software maintainability index revisited citeseerx. The f117 was based on the have blue technology demonstrator. The distinction between an indicator and a metric is when they are computed. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.
Maintainability and flexibility at the software level are of predominant importance to drive innovation at the business process level. Reliability, maintainability, and availability rma analysis. Technical documentary reports tdr scientific and technical records of research and development efforts, may be definitive or exploratory, factual or problematical, general or specific 4. Chances are great that some of the components came from country a, others from country b, and the rest from country c. Introduction to information system information system is referred to a set of organized components working together to collect, store, process. In software projects, it is most important to measure the quality, cost, and effectiveness of the project and the processes.
In todays article, we will learn with examples and graphs software test metrics and measurements and how to use these in the software testing. Welker idaho national engineering and environmental laboratory in 1991 oman and hagemeister introduced a composite metric for quantifying software maintainability. A green rating is between 20 and 100 and indicates that the code has good maintainability. The maintainability index is calculated as a factored formula consisting of sloc source lines of code, cyclomatic complexity and halstead volume. The eia is used to inform the environmental statement es or eia report, which forms the core documentary evidence that is submitted to support a consent application. Reliability, availability, maintainability, and cost. Rams home loans, an australian mortgage broker, now a subsidiary of westpac bank. Engines evolution of kubota technology kubota global site. Maintainability index range and meaning code analysis.
An intensive study of an issue, concept, or theory in quality assurance that is of special interest to both the faculty member and the students. Maintainability index report inappropriate project. The remainder of this document is composed as follows. The lockheed f117 nighthawk is an american singleseat, twinengine stealth attack aircraft that was developed by lockheeds secretive skunk works division and operated by the united states air force usaf. Achieving high maintainability, requires appropriate activities which must be started early in the design and development phase, and be coordinated by a maintenance concept. Compared to kerosene engines, diesel engines could provide these qualities at a much higher level, and soon became the norm for industrial engines.
Pdf maintainability of the linux kernel stephen schach. Introduction thesis overview the purpose of this research is to show how engineering schools, as a whole, perceive the role of reliability, maintainability, and supportability in the engineering field. A lack of maintainability will be evident as high product maintenance costs, long outof service times, and possible. Without measuring these, a project cant be completed successfully. Ee300 statistics system reliability problem youtube.
Pdf how to effectively define and measure maintainability. Evaluation of maintainability index of a mechanical system using graph theoretic approach. The radiated copolarization shall be horizontal whilst the vertical cross polarization component in the horizontal plane shall be at least 40 db below copolarization component. Pdf maintainability and flexibility at the software level are of predominant.
Analysis of reliability, availability and maintainability ram of sm48 diesel locomotive 4 cumulative distribution function of the time to first failure socalled unreliability function and the theoretical cumulative best match distribution function. To date, it is included in visual studio since 2007, in the. In addition to such qualities as durability and waterdust resistance, industrial engines require high standards of maintainability and stability. Maintainability index mi coleman, oman 1994 mi 2 can be used only if comments are meaningful if more than one module is considered use average values. Maintainability index mi article cited from wikipedia maintainability index is a software metric which measures how maintainable easy to support and change the source code is. These metrics are computed statically, without program execut. The corporation dvds topical paradise dvd 2 this is a list. Abstract misalignment is probably the most common cause of machinery malfunction. Professional papers pp articles which identify the author as an employee of aerospace and which are prepared for possible publication.
560 613 353 552 1210 1437 1548 943 557 246 949 272 997 1023 19 772 1026 361 1341 756 546 1159 1459 1020 596 31 1254 289 339 810 450 1466 1229 1216 1168