The systems development environment
Our intent is to help you understand all the pieces and how to assemble them.
Information systems activities revolved around heavy data processing and number crunching routines". Each phase is organized into a number of separate iterations.
7 stages of system development life cycle
Like anything that is manufactured on an assembly line, an SDLC aims to produce high-quality systems that meet or exceed customer expectations, based on customer requirements, by delivering systems which move through each clearly defined phase, within scheduled time frames and cost estimates. Sequential or big-design-up-front BDUF models, such as waterfall, focus on complete and correct planning to guide large projects and risks to successful and predictable results. Physical design — the logical specifications of the system from logical design are transformed into the technology-specific details from which all programming and system construction can be accomplished 14 Systems Development Life Cycle SDLC Cont. Propose alternative solutions: After digging into the organization's objectives and specific problems, several solutions may have been discovered. We may construct artificial boundaries or artificially separate activities and processes for learning purposes. Iterative methodologies, such as Rational Unified Process and dynamic systems development method , focus on limited project scope and expanding or improving products by multiple iterations. During this step, consider all current priorities that would be affected and how they should be handled. It consists of a set of steps or phases in which each phase of the SDLC uses the results of the previous one. These phases broadly speaking are, investigation, analysis, design, build, test, implement, and maintenance and support. Cost benefit analysis: Analyze and describe the costs and benefits of implementing the proposed changes. Development: The real code is written here. Some of the questions that need to be answered include if the newly implemented system meets the initial business requirements and objectives, if the system is reliable and fault-tolerant, and if it functions according to the approved functional requirements. Application Software Computer software designed to support organizational functions or processes Systems Analyst Organizational role most responsible for analysis and design of information systems 8 Developing Information Systems System Development Methodology is a standard process followed in an organization to conduct all the steps necessary to analyze, design, implement, and maintain information systems. Object class: a logical grouping of objects sharing the same attributes and behaviors Inheritance: hierarchical arrangement of classes enable subclasses to inherit properties of superclasses 37 Rational Unified Process RUP An object-oriented systems development methodology RUP establishes four phase of development: inception, elaboration, construction, and transition. Systems design: At this step desired features and operations are described in detail, including screen layouts, business rules , process diagrams , pseudocode , and other documentation.
Development: The real code is written here. Even if a problem refers only to a small segment of the organization itself, find out what the objectives of the organization itself are. Analysis of the proposed system: Find solutions to the shortcomings described in step two and prepare the specifications using any specific user proposals.
This includes evaluation of the currently used system, information gathering, feasibility studies, and request approval. Disposal: In this phase, plans are developed for discontinuing the use of system information, hardware, and software and making the transition to a new system.
Conduct the preliminary analysis: Discover the organization's objectives and the nature and scope of the problem under study.
Object class: a logical grouping of objects sharing the same attributes and behaviors Inheritance: hierarchical arrangement of classes enable subclasses to inherit properties of superclasses 37 Rational Unified Process RUP An object-oriented systems development methodology RUP establishes four phase of development: inception, elaboration, construction, and transition.
This involves the process of gathering and interpreting facts, diagnosing problems, and recommending improvements to the system.
based on 118 review