Question:
Discuss about the Non Functional Requirements Of The System.
Cloud computing is gaining importance with the passage of time. It can be considered to be an IT model or paradigm that facilitates the users to access shared resources by using the Internet. Cloud based solutions include resources, applications as well as services to the customers and users on the basis of their demand via Internet. Headspace organization manages young patients who are suffering from mental illness like depression. Their aim is to develop a health record system by using cloud based platform services. This system will be able to record patient’s story when they are narrating it for the first time (Steele, Min & Lo, 2012).
This report gives brief overview of the non functional requirements of the system. It depicts a comparison between the non functional and functional requirements of the health record system. This report discusses about the pros and cons of a cloud based solution. It talks about the strengths and weaknesses of the Adaptive and Predictive approach of SDLC. At the end it gives recommendation about selecting either the predictive or the adaptive approach.
Non functional requirements of a system are the specific attributes that helps in understanding about the operations and quality of the system as a whole. It is not possible to evaluate these attributes prior to its delivery to the clients (Chung, Nixon & Mylopoulos, 2012). The working ability of the system can be evaluated by understanding these attributes. Some of the non functional requirements are reliability, security and functionality. The non functional requirements of the Headspace project are discussed below.
This requirement is one of the main non functional requirements of the health record system. Functionality is based on the performance consistency of the system. The functionality in case of the health record system is to record patient stories at the time of initial narration. Another functionality of the system is its robustness and flexibility. The system be easily accessible to the users.
Usability is the ease with which the users will be able to access as well as use the system. It measures the degree to which the user needs will be satisfied. The system properties must be simple for the ease of the users. The usability of the system will be high if it is able to simplify the jobs in an effective manner. The error rate should be less. The heath record system must be developed in such a manner so that the users do not face any issue while dealing with the system.
A system is considered to be reliable if it functions accurately and if the chance of failure is very low. The reliability of the health record system will be based on its ability to record the patient story and details accurately. Time for recovery of the system should be less. The system should be able to recover data whenever required.
System performance is completely dependent on its throughput, availability and response time. The size of RAM and speed of the CPU plays a significant role in the performance of the system. The performance of the health record system should be high with quick response time and high throughput. The data processing speed of the system should be high so that the correct data is available at the correct time. A summary button can be added for getting a quick overview of the patient details.
Security concerns of information systems are increasing at a fast pace. Sensitive information about the patients will be stored in the health record system. It must be protected with strong security policies for preventing any unauthorized users to gain access to the sensitive data (Kulkarni et al., 2012). The integrity and confidentiality of the data needs to be maintained. Security is an essential non functional requirement of the health record system.
Functional requirements describe the system functionality. It says what should be done by the system. It is responsible for specifying the function and behavior of the system. This requirement is an essential part of the contract as it points out the actions to be performed by the system. These requirements are focused on technical functionalities.
One main functional requirement of the health record system is its authentication factor. Authentication will allow only authorized users to access the sensitive information. A system of biometric authentication can be implemented (Jain & Nandakumar, 2012). This requirement is related to the security feature of non functional needs of the system. Professionals belonging to different levels must have access to different information (Pearce & Bainbridge, 2014). Another functional requirement is that the system should have the ability to give accurate summary about the patient details. This is related to the functionality aspect of the non functional need or requirement.
Functional requirements describe the services or functionalities of the system but the non functional requirements deal with certain attributes for judging the system operation and performance after its delivery to the customers.
Cloud based solutions provides several benefits to the users. The major strengths of cloud based solutions are discussed below:
Cost Effective: Cloud based solutions are inexpensive. The operational as well as the capital expense of the organization will be minimized by deploying cloud models. The cost of in-house storage is saved by using cloud based solutions (AlZain et al., 2012). The users need to pay small amount of money depending on the on demand services provided by the cloud.
Reliability: The cloud based solutions are more reliable than the storage facility that is in-house (Galibus & Vissia, 2015). The backup mechanism is quick in cloud platform. When there is server failure, then the cloud services can be used in other servers are not down.
Competitive Advantage and Manageability: The IT system can be managed by the cloud services in a simplified manner. The vendors take the responsibility for maintaining the software on a regular basis. The organization that adopts cloud based solutions gain competitive advantage. The users can focus on the productivity of the business and save time by using cloud based platforms.
There are few cons of cloud based solutions:
Downtime: When the cloud servers are down then it affects the business activities ultimately leading to business loss.
Security: The cloud platforms are susceptible to various security attacks like phishing attacks, DoS, Trojan horses and virus attacks. The system can even get hacked for accessing sensitive data (Rittinghouse & Ransome, 2016).
Limited Control: The third party vendors have full control over the system. The users do not have backend control over the cloud platform.
The users have a direct access to the private infrastructure of the hybrid cloud (Li et al., 2013). The users take much less time to access the hybrid clouds in comparison to access time of the public cloud. Hybrid clouds are known for offering user designs that are flexible in nature (Li et al. 2015). Hybrid cloud has a computational infrastructure that can support business workload in an effective manner.
The users have to spend more on hybrid cloud than in public cloud (Chen & Zhao, 2012). The expenditure involved in public cloud infrastructure is much less. Security issue is a major limitation of the hybrid cloud infrastructure. The hybrid clouds are not compatible with every infrastructure and this is another major issue of the hybrid cloud.
Software development life cycle or SDLC is used for describing the various phases of developing a system or software. SDLC contains many phases for the purpose of determining the feasibility of the system, planning for the development, implementing the plan followed by testing and system maintenance program. The predictive and adaptive SDLC approach has been described below.
The predictive approach of SDLC determines all the phases that are needed for the development of software. These stages and sequential steps are determined before the implementation process. This approach includes a fixed delivery schedule (Tuteja & Dubey, 2012). This type of approach is best suited for projects whose requirements are understood in a clear manner prior to its development. It can be used for projects that have been developed previously.
Pros of predictive approach are:
Cons of predictive approach are:
Adaptive and predictive approach is different from each other. Adaptive approach is a flexible approach where there is no fixed execution schedule or delivery plan (Balaji & Murugaiyan, 2012). This is not a sequential approach. Improvisation and modification of project plan is possible in this approach at any stage.
Pros of adaptive approach are:
Cons of adaptive approach are:
It can be suggested that the adaptive approach will be best suited for the Headspace project. It will help to modify and improvise the project plan as per the user needs and requirements (Mahalakshmi & Sundararajan, 2013). The feedback mechanism of this approach will help to reduce the chance of failure of the system.
Conclusion
It can be concluded from this report that the health record system should adopt the Adaptive SDLC approach because of its various advantages. This report presented a comparison between the functional and non functional requirement of the system. It explained the pros and cons of a cloud based solution. The advantages and limitations of the hybrid cloud are also discussed in this report. This report also gave a brief overview of the limitations and advantages of the predictive as well as the adaptive SDLC approach.
References
AlZain, M. A., Pardede, E., Soh, B., & Thom, J. A. (2012, January). Cloud computing security: from single to multi-clouds. In System Science (HICSS), 2012 45th Hawaii International Conference on (pp. 5490-5499). IEEE.
Balaji, S., & Murugaiyan, M. S. (2012). Waterfall vs. V-Model vs. Agile: A comparative study on SDLC. International Journal of Information Technology and Business Management, 2(1), 26-30.
Chen, D., & Zhao, H. (2012, March). Data security and privacy protection issues in cloud computing. In Computer Science and Electronics Engineering (ICCSEE), 2012 International Conference on (Vol. 1, pp. 647-651). IEEE.
Chung, L., Nixon, B. A., Yu, E., & Mylopoulos, J. (2012). Non-functional requirements in software engineering (Vol. 5). Springer Science & Business Media.
Galibus, T., & Vissia, H. E. R. M. (2015). Cloud storage security. Proc NSCE, 2014, 123-127.
Jain, A. K., & Nandakumar, K. (2012). Biometric Authentication: System Security and User Privacy. IEEE Computer, 45(11), 87-92.
Kulkarni, G., Gambhir, J., Patil, T., & Dongare, A. (2012, June). A security aspects in cloud computing. In Software Engineering and Service Science (ICSESS), 2012 IEEE 3rd International Conference on (pp. 547-550). IEEE.
Li, J., Li, Y. K., Chen, X., Lee, P. P., & Lou, W. (2015). A hybrid cloud approach for secure authorized deduplication. IEEE Transactions on Parallel and Distributed Systems, 26(5), 1206-1216.
Li, Q., Wang, Z. Y., Li, W. H., Li, J., Wang, C., & Du, R. Y. (2013). Applications integration in a hybrid cloud computing environment: Modelling and platform. Enterprise Information Systems, 7(3), 237-271.
Mahalakshmi, M., & Sundararajan, M. (2013). Traditional SDLC Vs Scrum Methodology–A Comparative Study. International Journal of Emerging Technology and Advanced Engineering, 3(6), 192-196.
Pearce, C., & Bainbridge, M. (2014). A personally controlled electronic health record for Australia. Journal of the American Medical Informatics Association, 21(4), 707-713.
Rittinghouse, J. W., & Ransome, J. F. (2016). Cloud computing: implementation, management, and security. CRC press.
Steele, R., Min, K., & Lo, A. (2012). Personal health record architectures: technology infrastructure implications and dependencies. Journal of the Association for Information Science and Technology, 63(6), 1079-1091.
Tuteja, M., & Dubey, G. (2012). A research study on importance of testing and quality assurance in software development life cycle (SDLC) models. International Journal of Soft Computing and Engineering (IJSCE), 2(3), 251-257
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