Review and Comparison of Different Software Quality Models

Review and Comparison of Different Software Quality Models Muhammad Qasim Riaz1 and Zeeshan Asif2 1,2Department of Computer Science, University of Agriculture, Faisalabad, Pakistan Abstract Software quality models are one of the best means for the support of software quality management system. Since more than 30 years, several quality models have been offered and used with fluctuating mark of success. To be particular, with the idea of defining the multidimensional content of software quality management system a variety of qualitative models have been presented by which different aspects of this topic have been tried to be investigated properly. By investigating the trends and evolution of software quality models and identifying differences in the approaches and judgment outcomes, the results indicate significant progress in the development of software quality models. Many definitions and models of software quality are studied and a competitive conclusion is drawn. It carries on with a review of the quality models and comparison between them. Introduction The main aspects of the quality at which every software engineer should focus himself are reviewed and compared [4] in this paper. Now a days, in modern age of technology large firms and companies spend millions and billions of dollars at the IT projects to get precise and efficient software services. Our first point is, what is meant by quality [1] in software products. What should we do to a software product to decide it as a quality product, simply a good product or name it as a failed product. Many papers have been published about the causes of project failure e.g. [8]. Several models and many success factors are presented for effective and precise management of projects to make up the quality of products [5]. This paper is taking a review by examining factors and points discussed in different models like Boehm, McCall and many others[9][8]. We also illustrates their impact on quality of the software product. Secondly, many models are presented by different researchers, organizations and scientists. Most of the scientists followed the basic models of software quality presented by the McCall, Boehm, and FURPS. On the basis of these models IEEE and ISO presented new models and also did many additions like ISO 9126. This paper emphasizes all these models of quality factors and explains a comparison between them. How to measure the quality of software and which scales are defined to measure it, are also mentioned in the paper. At the end, effect of quality at the cost and demand of software will also be discussed. We have reviewed and compared the following software quality models in this paper: McCalls software Quality Model Boehms software Quality Model FURPS software Quality Model IEEE software Quality Model ISO 9126 software Quality Model A quality model is mostly stated as a set of characteristics like document clarity, design trace-ability, integrity, program reliability, test integrity and relationships among them which truly provide the foundation for identifying the requirements of quality and calculating quality. It can be identified as defined set of properties that are required for a product to meet stated purposes. The advantage of quality model is determined by the decomposition of main objects like product, process or organization in the list of its properties and characteristics. It is applicable for forecasting, guaranteeing and authenticating the accomplishment of a well-defined goal. Quality Defined As the quality of any object/thing in universe can be defined as: The measure of standard of any object/thing against the other objects/things of same kind is known as the quality of that object/thing. OR It can also be defined as the degree of superiority or inferiority of something as compare to the other things of same type. For example the quality of a computer depends on the speed of the computer, reliability of the computer, consistency of the computer and many other factors like that. Similarly, the dictionary definitions of quality in computing largely concentrated on excellence and improvement in product International Standards(IS) professionals should focus. Quality according to ANSI Standard can be define as Quality is the sum of characteristics and features of a software product or a service that bears on its capacity to fulfill the given needs Quality according to IEEE Standard (IEEE Std. 729-1983) All the characteristics and features of a software product which stand on its capacity to fulfill the particular requirements [6]: for example, follow to conditions. The grade to which software keeps a wanted mixture of features. The mark at which a consumer observes that software meets his mutual outlooks. The multiple characteristics of software that define the unit according to which the software product in use will meet the hopes of the customer. General Kinds of the Models Now a days, most of the quality models are hierarchical models which are based on the basic principles of the quality and related metrics [7]. All of these models are classified on the basis of the means and ways according to which they have been generated. These are categorized into the following three types. The assumed model is based on the hypothesis relationships among variables used. The model based on data-driven by a statistical analysis of related matrix in model. This model is the mutual effect of hunches which are used to determine the simple type of the model and secondly the Data analysis used to formulate the constants of the model along with the variable values. Different Quality Models 4.1 McCalls Quality Model This was the first ever quality model presented by the Jim McCall in year 1977 which is also called General Electronic Model [8]. Before presenting this model there was no any authentic model to review or check the quality of the product. This model provides a set of the basic characteristics to measure the quality of product. Figure 1. McCalls quality model and all of its components Three major perceptions of the McCall model for declaring and recognizing the quality of the product are presented following: Product Operation: The degree of any product that how much quickly and easily it can be understood, it includes, reliability, correctness, efficiency, integrity and usability criteria. Product Revision: it covers the maintainability, testability, changeability, flexibility and debugging of the product. Product Transition: it deals with the adaptability with the environment, portability, reusability and interoperability of the product. 4.2Boehms Quality Model Boehms software quality model [9] offers more attributes and characteristics of product than McCalls quality model. It was presented by Barry W. Boehm in 1978. Boehms model is almost similar to the McCall Quality Model because it also presents a hierarchical quality model designed about high-level, intermediate level and primitive characteristics, each of them plays an important role in the overall quality level. All above stated levels represent the questions of buyer, the quality factor which can affect or represent the quality of product and offers the basis for describing qualities metrics. Figure 2. Boehms quality model and all of its components Almost both Boehms and McCalls models similar to some extent [10].The difference in these two models is that McCalls model mainly centers on the accurate measurement of the high-level characteristics As-is utility. On other hand Boehms quality model is dependent on a broader range of characteristics with a stretched and detailed emphasis on primarily maintainability. 4.3 FURPS Quality Model FURPS model was presented after the McCalls and Boehms model. It was firstly presented by Robert Grady and Hewlett Packard Co. the abbreviation of word FURPS stands for Functionality, Usability, Reliability, Performance and Supportability of the product under development [11]. Functionality: Functionality contains combination of characteristics, security, features and capabilities. Usability: This section covers the factors which affect usability of the product like Human Factors, Aesthetic, material of training and documentation of the user. Reliability: It ensures the reliability and integrity factors like Recovery to failures Time among failures, Frequency and severity of failures. Performance: Enforces conditions on practical necessities like speed, availability, efficiency, throughput, accuracy, resource usage, response time and recovery time. Supportability: This section contains the components like Extensibility, Adaptability, Maintainability, Compatibility, Configurability, Install ability, Serviceability and Localizability. Figure 3. FURPS quality model and all of its components 4.4 IEEE Quality Model Institute of Electrical and Electronics Engineers (IEEE) [12]. It is an international organization which also provided many standard models for the software product quality and maintenance. It presented, many standards of software quality assurance and verification/validation of the software product. The abstract figure of IEEE software quality models is given forward: Figure 4. IEEE quality model and all of its components This model illustrates several ways for the measurement of qualitative factors and reflects factors like Efficiency, Functionality, Maintainability, Portability, Reliability and Usability. Efficiency: It includes the characters like time and resources. Reliability: It contains the factors and the characteristics which are used to increase and maintain the maturity and reliability by fault tolerance and Recoverability. Functionality: It includes characteristics like accuracy, compatibility, completeness, security and interoperability. Supportability: It helps in maintaining the testability, extendibility and correctability. Portability: It makes the software portable by ensuring characteristics like hardware independency, software independency, adaptability, install-ability and reusability. Usability: It ensures the comprehensibility, communicativeness and ease of learning. 4.5 ISO 9126 Quality Model ISO 9126 [14] [13] is presented by the international standard organization. It is one of the most implemented and used quality model for maintaining the quality of the software product. This modern model is based at the previous models like McCall, Boehm, FURPS and many other old versions of the ISO like ISO 9000 and etc. Figure 5. ISO 9126 quality model and all of its components This version of ISO also takes account of functionality as parameter and include identification of both internal quality characteristics and external quality characteristics of the products. The characteristics new version of this model [15] contains are Efficiency, Maintainability, Functionality, Reliability, Portability and Usability. Efficiency: It contains the characters which affects the throughput in a given time and resources used. Reliability: It includes the Maturity, Fault Tolerance and Recoverability. Functionality: It contains many essential characteristics which are necessary for the proper functionality of the product like suitability, accurateness, interoperability, compliance and security. Maintainability: It helps in maintaining the changeability, stability and testability by using analyzability. Portability: It makes the software more dynamic and portable by ensuring characteristics like adaptability, install-ability, conformance and replaceability. Usability: It makes sour that the learnability and operability of the software product should be easy and simple. 5. Comparison of Models According to the above study and figures we did a comparison between all of the models to justify our competitive study. McCall Model: according to the reference [] and the figure 1 of McCall model we can observe it can say following characteristics are included in this model correctness, reliability, efficiency, integrity, usability, flexibility, maintainability, testability, portability, interpretability and reusability. Boehms Model: As shown in the above figure 2 and the literature the characteristics owned by the Boehms model [] are device independence, self-contentedness, understandability, modifiability, testability, human engineering, efficiency and reliability. FURPS Model: FURPS is the combination of functionality, usability, reliability, performance and supportability these are further classified into security, capabilities, availability, efficiency, throughput, accuracy, resource, response time, integrity, failures, human factors, documentation, extensibility, maintainability, compatibility, install ability and serviceability. All these characteristics are mentioned in reference no. . IEEE Model: As we mentioned above the IEEE model is consist of the external and internal characteristics like functionality, reliability, supportability, usability, efficiency and portability these external characteristics are sub divided into internal characteristics like time, resources, error tolerance, availability, completeness, accuracy, security, compatibility, interoperability, testability, correctability, hardware independence, software independence, installability, reusability, usability, comprehensibility, ease of learning, extensibility and communicativeness . ISO 9126 Model: ISO 9126 is the combination of all the models it includes all the best characteristics which are necessary for building up a satisfactory product. The main characteristics of the ISO model are functionality, reliability, maintainability, usability, efficiency and portability. The derived sub characteristics form those main characteristics are suitability, accurateness, interoperability, compliance, security, maturity, fault tolerance, recoverability, understandability, learnability, operability, time behaviour, resource behaviour, analyzability, changeability, stability, testability, adaptability, installability, conformance and replaceability. 6. Conclusion We have studied several types of software quality models which are different on the basis of their characteristics and methodologies. Really it was a great task and challenge for us to conclude which model is the best and which we should prefer to implement in developing a good software product. In this paper we have also made a comparison table (above) to understand the real differences in the models. This table also shows which features and characteristic a model contains or lacks. We have studied and compared the following models. McCalls Model: In McCalls quality model, the quality is mostly measured on the basis of judgment of the person(s) or the users by answering the questions given in a questioner. (Yes or no questions). Boehms Model: While Boehm concentrates on the levels based upon the characteristics of the product. FURPS: The FURPS quality model is made and stretched to be cast-off in the IBM Rational Software Company. So, it is a special-purpose quality model, which is presented, for the benefits and betterment of that company. IEEE: It is also a good model to implement. It uses different measurement ways and standards like software quality assurance to maintain the quality of the product. ISO 9126: The ISO 9126 quality model is the most useful model it has been figured on the basis of international agreements and accordance from all the countries which are members of the ISO organization. In result of the comparative study ISO 9126 is best model. But it depends at your software product and the organizations that which model is best for use. It is a satisfactory and successful completion we hope it help the new users to understand the quality models properly and easily. Quality Characteristics Models McCall Boehm FURPS IEEE ISO 9126 Stability Integrity Security Maturity Usability Accuracy Flexibility Efficiency Reliability Portability Testability Reusability Functionality Analyzability Modifiability Performance Install Ability Supportability Interpretability Maintainability Fault Tolerance Understandability Time Management Self-contentedness Availability Human Factors interoperability compliance Suitability Replaceability adaptability Device Independence References [1] Khomh, F., Haderer, N. and Antoniol, G. (2009). SQUAD: Software Quality Understanding through the Analysis of Design, Reverse Engineering, WCRE09, 16th working conference [2]Dubey, S.K., Gosh, S. and Rana, A. (2012). Comparison of Software Quality Models: An Analytical Approach. International Journal of Emerging Technology and Advanced Engineering, ISSN 2250-2459, Vol. 2, No. 2, pp. 111-119. [3]Robson, C. (2002). Real world research: a resource for social scientists and practitioner-researchers, Blackwell Publisher Ltd. [4]Sharma, K. and Sharma, K. (2013). Comparison of various software quality products, Proc. of the Intl. Conf. on Recent Trends in Computing and Communication Engineering, RTCCE 2013 [5]Sharma, A., Kumar, R. and Grover, P. S. (2008). Estimation of Quality for software components: an empirical approach, ACM SIGSOFT Software Engineering Notes, 33(6), pp. 1-10 [6]IEEE STD 729. (1983). IEEE Standard Glossary of the Software Engineering Terminology [7] Pressman, R. S. (2012). Software Engineering a practitioners Approach 7th Edition. McGraw-Hill, Inc. [8]McCall J. A., Richards, P. K. and Walters, G. F. (1977). Factors in Software Quality, Vol. 1, 2 and 3, AD/A 049-014/015/055, National Tech. Information service, Springfield. [9] Boehm, B. W., Brown, J. R., and Lipow, M. (1976). Quantitative evaluation of software quality, International Conference on Software Engineering, Proceedings of the 2nd international conference on Software Engineering (2nd):592-605. [10]Boehm, B. W., Brown, J. R. and Kaspar, J. R. (1978).Characteristics of software Quality, TRW Series of software Technology, Amsterdam, North Holland. [11]Ghezzi, Jazayeri, C. M. and Mandrioli, D. (1991). Fundamental of software Engineering, Prentice-Hall, NJ, USA. [12] IEEE (1993). Standard for Software Maintenance, Software Engineering Standards Subcommittee of the IEEE Computer Society. [13] ISO/IEC TR 9126-3. (2002). Software Engineering Product Quality. [14]ISO 9126. (2000)E. Standard ISO/IEC, Information technology- Software product quality Part1: Quality Model, ISO/IEC FDIS 9126-1: 2000(E) [15]ISO/ IEC 25030. (2006). Software Engineering: Software Product Quality Requirements and Evaluation (Square), Quality Requirements.

Cherokees :: essays research papers

Thesis: The fierce struggle of European nations to dominate the New World caused the Texas Cherokees to be “caught between two fires.'; The two fires Everett refers to is not only in respect to white settlers pushing westward and resistance from other tribes to the east, but between removal and extermination. The Texas Cherokees courageously strived to remain determined in a situation which they were able to alter somewhat but were not able to take control. Everetts depiction of the Texas Cherokees experiences fully supported the thesis presented. The thesis was clearly stated in the preface and the use of specific examples helped to strongly support it as portrayed below. The arguments were followed with supporting statements as portrayed below as well. Everett presents us with a fair, two sided account of the confrontations between the Texas Cherokees and the European settlers. One component of the thesis Everett relates to the Cherokees caught between white settlers pushing westward and resistance from other tribes to the east. Everett gives several examples of Europeans pushing the Cherokees westward. In 1817, the Western Cherokees signed a treaty giving up land rights in the east to Europeans in exchange for permanent reserve in northern Arkansas. (Everett 14) She also demonstrates the resistance received from western tribes. “Warfare with Comanches would replace warfare with Osages.'; (Everett 25) Both statements are examples of how the Texas Cherokees were literally “caught between two fires'; and was very effective. Another aspect of the thesis relates the Texas Cherokees caught between removal and extermination. Everett strongly supports this aspect of the thesis when she gives the example of the new president of the Republic of Texas sending a letter to Duwali’s village. It states that “the red man and the white man cannot dwell together'; and goes on to say, “their final removal is contemplated.'; (Everett 103) This statement alone describes the European feelings toward the red man. It proves how Europeans refuse to negotiate with “savages'; and will use force if they do not cooperate. The third topic of the thesis Everett attempts to prove deals with the determination of the Texas Cherokees to attempt to control the situations they were faced with. It is stated that five hundred warriors took part in the final battle Chief Duwali would fight in. (Everett 108) This proves the determination in the Cherokees hearts. Instead of giving up and moving east they decided to take a stand with overwhelming odds against them.

Management Essay

The management functions of planning, organizing, leading, and controlling Management is the attainment of organizational goals in an effective and efficient manner through planning, organizing, leading and controlling organizational resources. The success of an organization is determined by four essential functions of management: controlling, leading, organizing, and planning. Controlling involves directing and monitoring the progress of employees. Controlling employees and the work environment helps employees to stay focused on goals set by the management. Management must provide superior leadership skills by making their presence known in the work environment. Employees have a basic need of having contact on a daily basis with management. By leading managers motivate their employees and increase efficiency. Management makes an organization successful by organizing all aspects of business which would include business functions; creating organizational charts, setting goals, creating an action plan, and figuring out the logistics to make sure goals are achieved. Management must use the function of control to stabilize employee performance and the work environment. Control is always viewed as a negative term because employees think of being restricted. However, controls are placed for the benefit of everyone, without a controlled organization there would be chaos. Within my organization, management maintains control by setting clear guidelines each employee must obey. â€Å"Managers expect people in an organization to change their behavior in response to control† (Erven, 1994). Since my colleagues and I work as independent contractors everyone has the power to choose their own schedule. Management controls the environment by making everyone adhere to the set schedule by 75% or better. When contractors meet their commitment, they are rewarded with a pay incentive. Prior to this policy being enforced, performance was lower, since this control has been in place performance has increased dramatically. Leading Management is expected exercise the function of leading in order for the organization to meet their goals. Leading is an essential function of management because it helps management direct employees to focus on the big picture. Typically management will focus on increasing productivity to improve cost efficiency. In order to improve productivity, employees need direction and motivation from management. At my organization, employees are paid based on commission. Management provides employees with information about busier working hours so that employees have the opportunity to maximize their efforts on those hours. At the end of the day, management wants the needs of the customers to be met as well as employees to be satisfied with their compensation. Organizing Organizing is a critical component of good management, because everything within the organization is depending on the organizational skills of the management. Management is primarily responsible for organizing resources in order for goals to be met (Bateman & Snell, 2007). Within the organization, management must create an organizational chart which would describe the business function and responsibility of each person on that chart. Management would assume responsibility for all logistics to be in place to assist their employees of meeting their goals. In my organization, a critical component of organizing involves having all of the necessary technology functioning properly since business is conducted by phone and internet. On a daily basis the management has to make sure the phone routing system is functioning properly as well as their websites. Occasionally technical problems occur, and they must be handled immediately or else business will suffer if the necessary technology is not available. Planning Planning is essential component to the other three functions of management running smoothly. Planning involves the management team identifying goals and objectives within the organization. Once goals are mapped out, management must work together to analyze the current state of the organization and make a plan of action to implement immediate changes. In order to plan successfully, management must anticipate circumstances they could be affected by. Based on goals, objectives, and their forecast into the future they can begin to create business strategies. The management in my organization focuses on increasing the volume of customers. When the volume of customers drops, promotions occur more often to lure customers in. In order to prepare for unthinkable situations such as a drop in business management must work within other departments to develop contingency plans when business is not going as planned. The roles and responsibilities managers have within an organization. There are managers in every profession – it is not a standalone field. For those of us who become managers, we reach a stage in our career progression where we apply for roles which have management responsibilities. We then need to build our managerial experience and gain the knowledge and skills to enable us to carry out the role effectively. As a manager, there are many responsibilities must follow. Managers take on an essential responsibility for communication. Particularly with the pace of change, it ismore important than ever to keep employees informed of what’s going on. In performing the informational role, managers are essentially two-way information conduits. Managers must keep employees informed of all things that affect their work and provide information to their organisation (and, often, outside their organisation) about what the team is doing. To undertake PDRs with staff. Through the PDR process, to engage in the setting of objectives in order to assist in the monitoring of performance and the development of the individual. To assess the training and development needs of staff to ensure that they are adequately supported in relation to their work responsibilities. Managers are also required to ensure that staff have completed the relevant mandatory training for their role. To ensure appropriate management systems and procedures are in place to meet your health and safety duties. You will find your responsibilities contained in the University’s Health and Safety policy. You are required to ensure appropriate risk assessments are carried out in respect of significant hazards and safety inspections. To apply the University’s Equal Opportunities Policy. Line managers are responsible for maintaining a working environment that is free of discrimination, harassment, victimisation and bullying. In applying the Universities Equal Opportunities Policy and associated training, line managers have an important role in ensuring that no person associated with MMU receives less favorable treatment on the grounds of: gender, race or ethnic origin, nationality, disability, sexual orientation, social background or for any other identifiable discriminatory cause. There will be other responsibilities for you dependent on your managerial level within the University. You should speak to your own manager if you need to clarify any of these.

Religion Should Not Be Allowed in Public Schools - 1293 Words

While students are attending public schools they should be aware of their religion options. The student should have the right to practice their religion as they please, just on the own time. Yes, religion plays a huge part in molding a person but, should be practiced when the time is available, not in a classroom setting. The government should have the ability to control the protection of the students that just want to learn. The capability to regulate the religious practices while attending public educational institutions should be left to the government. Faith, religion and belief, usually are three words that are used to describe one situation, although these words have three different meanings. To have faith in something or someone you†¦show more content†¦Thoreau wants everyone to have his or hers own voice. The importance of standing up for what one person believes, even when everyone around that person states he or she is wrong, is substantial to that someone’s belief. Having the will power to show courage is more than joining the majority. Everyone in the United States has the freedom to religion, the freedom to believe what he or she wants to believe in. In an article in USA Today, the opinions of Senator Dennis Kruse, and Andrew Seidel, staff attorney for the Freedom from Religion Foundation, were addressed. Sen. Kruse wrote a bill, seeking the Lord’s Prayer in public schools. The Senator writes this bill stating, â€Å"school districts to require the recitation of the Lords Prayer, though individual students could opt out if they or their parents preferred† (USA Today). Senator Kruse allowed the option for the students to partake in this prayer but still required it for all districts. Students throughout the public school could feel uncomfortable and uneasy. What the Senator fails to recognize is that all student are not aware of the meaning of the Lord’s Prayer, yet alone the religious connection that it represents. Mr. Andrew Seidel expresses his concern about this bill by stating: Bullying is a huge issue in schools right now, and to have students have to out themselves (by refusing to go along with a prayer they dont believe in) is going to open the whole atheist community up to bullying.Show MoreRelatedReligion in Public Schools Essay1131 Words   |  5 PagesDefinition: Religion in school is the practice of any personal religious beliefs in a place of education. Introduction: In recent years teaching or the individual practice of religion in school has become a very controversial topic. There are many different views on this matter and even more opinions on how it should be handled. 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