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/README.md:
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1 | ## SDLC Interview Question :) 🦖
2 | ## The Phases of the Software Development Lifecycle🚱
3 |
4 |
5 | The software development lifecycle (SDLC) is a framework that development teams use to produce high-quality software in a systematic and cost-effective way. The SDLC methodology is used by both large and small software organizations.
6 |
7 | Developers often think that only one of the seven stages of the system development life cycle applies to them. But, to work at their best, everyone in a software development team should have a good working knowledge of all stages of the SDLC.
8 |
9 | Below, we discuss each stage and where it fits into the bigger picture. We also provide examples of expected output, describe team members needed, and share resources for individual learning.
10 |
11 |
12 |
13 | ## 1. Planning Stage 🦖
14 |
15 | In any software development project, planning comes first. Before getting started, it is important to make sure the project has enough people and financial backing. You can have the best idea in the world, but if you don’t have people or money, moving forward will be a poor business decision.
16 |
17 | The planning phase involves the entire project team. The outputs from the planning stage include project plans, cost estimations, and procurement requirements. When you are finished, your plan should be something the entire team can understand.
18 |
19 | Here are resources for getting better at planning:
20 |
21 | Book: Software Estimation Without Guessing
22 |
23 | Course: Project Planning & Management
24 |
25 |
26 |
27 | ## 2. Feasibility or Requirements Analysis Stage 🦖
28 |
29 | In feasibility analysis, your team ensures that the project requirements help the end-user of the system.
30 |
31 | Gathering requirements means talking to stakeholders and looking at as much relevant data as possible. At all times, you’ll want to consider the users and how workable the feature is.
32 |
33 | The outputs from the requirements analysis stage will vary depending on the methodology you are using. Regardless of whether your team is working with a formal requirements document or a list of tickets, everyone has to understand each need.
34 |
35 | At this stage, architects, developers, and product managers work together with relevant stakeholders.
36 |
37 | Resources for getting better at feasibility or requirements analysis include:
38 |
39 | Book: Mastering Software Project Requirements
40 | Blog: Seilevel on Requirements
41 |
42 | ## 3. Design and Prototyping Stage 🦖
43 |
44 | During the design phase, developers and designers prototype a feature or map out a solution. Prototyping is useful for getting early feedback and informing technical decisions.
45 |
46 | Without prototypes, there’s a risk that the team will waste time on production-ready solutions that don’t meet user needs.
47 |
48 | For some software development methodologies, the design phase needs specific output before a stakeholder can sign it off and more work can happen.
49 |
50 | When done well, the design and prototyping phase can produce tangible outputs that help drive decisions going forward. In web development teams, a prototype often serves to show that the functionality works, although it will still need polishing.
51 |
52 | The following are resources for getting better at design and prototyping:
53 |
54 | Video: Prototype Everything
55 | Book: Design Patterns
56 |
57 | ## 4. Software Development Stage 🦖
58 |
59 | Software development turns your project’s requirements and prototypes into working code. it’s the earliest phase in which you start to see something that resembles the final product.
60 |
61 | By the end of this stage, you will have a working feature to share with customers.
62 |
63 | Developers are the most involved during this phase. They will often need to confirm things with the product owner and the testers.
64 |
65 | Consider these resources for getting better at software development:
66 |
67 | Conferences: The Lead Developer
68 | Book: Adaptive Code
69 | Pro Tip: Code faster with TextExpander
70 |
71 | TextExpander makes it easy to save commonly-used code snippets, documentation comments, and more — then insert them anywhere you type with a simple shortcut or inline search.
72 |
73 | ## 5. Software Testing Stage 🦖
74 |
75 | During the software testing phase, testers put the code through its paces.
76 |
77 | Testers check for:
78 |
79 | Code quality
80 | That code meets the stated requirements
81 | That code is performant
82 | Evidence of secure development principals
83 | Some teams automate all their testing. Other teams test manually, but most do a combination of the two.
84 |
85 | The output of software testing is a better solution that meets edge cases and user needs. Developers can’t code for every eventuality; the fresh perspective that testing brings can help.
86 |
87 | Testers are the main people involved at this stage. They will often seek clarification from developers or product owners.
88 |
89 | Resources for getting better at software testing include:
90 |
91 | Book: Agile Testing
92 | Conference Videos: EuroSTAR Software Testing Conference
93 |
94 | ## 6. Implementation and Integration 🦖
95 |
96 | Often called ‘deployment’, the implementation phase takes code and puts it somewhere people can use.
97 |
98 | In simple projects, this will be as simple as deploying the code onto a web server. In large projects, this could involve integration with many different systems.
99 |
100 | The output from this stage is usable software. For some projects, this phase also encompasses the creation of documentation and marketing material.
101 |
102 | At this stage, the operations team focuses on deploying the software. The product owners work with content writers to produce documentation such as user manuals.
103 |
104 | Here are resources for getting better at implementation and integration:
105 |
106 | Book: The Phoenix Project
107 | Blog Post: How To Deploy Software
108 |
109 | ## 7. Operations and Maintenance 🦖
110 |
111 | In the operations and maintenance phase, developers watch software for bugs or defects. If they find one, they create a bug report. During maintenance, it is important to consider opportunities for when the development cycle starts over again.
112 |
113 | A sign that this phase is working well when developers are able to quickly identify and resolve problems.
114 |
115 | During this stage, support specialists will report issues, product owners will help prioritize them, and developers will work with testers to make improvements.
116 |
117 | Here are some resources for getting better at operations and maintenance:
118 |
119 |
120 |
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165 |
166 |
167 |
168 |
169 |
170 |
171 |
172 |
173 |
174 |
175 |
176 | ## What is the Software Development Lifecycle?
177 |
178 | The software development lifecycle (SDLC) is a framework that development teams use to produce high-quality software in a systematic and cost-effective way. The SDLC methodology is used by both large and small software organizations. These teams follow development models ranging from agile to lean to waterfall and others.
179 |
180 | The software development lifecycle gives organizations a methodical, step-by-step approach to developing successful software. From gathering the initial requirements for a new product, through maintaining a mature product on the market, we’ll teach you how to employ SDLC.
181 |
182 | # Origins of the Software Development Lifecycle:-
183 |
184 | SDLC actually began as the “systems development lifecycle” in the 1960s. As Geoffrey Elliott explains in his book, Global Business Information Technology, large corporations developed the model to help manage complex business systems that required a lot of data processing and analysis.
185 |
186 | Over time, variations of the framework have been adopted for the development of hardware and software technology products and other complex projects.
187 |
188 |
189 | # The Phases of the Software Development Lifecycle:-
190 |
191 | Several versions of the software development lifecycle have evolved. Guru99, for example, uses a seven-phase SDLC framework that separates requirements collection and a feasibility study into two separate phases. Other organizations, such as Software Testing Help, combine these two steps into a single phase 1: “requirements gathering and analysis.”
192 |
193 | We’ve reviewed many variations of software development lifecycle models. The following six-phase framework seems to be the most straightforward.
194 |
195 | ## Phase 1: Plan
196 | The first stage of new software development will be to gather all relevant information from stakeholders and analyze this information to determine what will be feasible.
197 |
198 | This includes compiling requirements, studying user personas, and agreeing on the product’s purpose. During this phase, the team will also discuss the opportunities and risks of pursuing the project. This is why Software Testing Help refers to this phase as both requirements gathering and analysis.
199 |
200 | ## Phase 2: Design
201 | After the team has agreed on a broad set of requirements and goals for the product, the next step will be to create a design specification. This should answer the question, “How will we build this?”
202 |
203 | For a product team, this phase would include determining the priority order of the proposed work, building a product roadmap, and obtaining stakeholder agreement on it. This will help everyone on both the development and product teams get a clearer picture of what they are aiming for.
204 |
205 | ## Phase 3: Implement (or Code)
206 | This is the stage where the engineering team actually codes the product. At this stage, the development team translates the high-level overview communicated in the roadmap into a tactical set of assignments, due dates, and day-to-day work schedules.
207 |
208 | ## Phase 4: Test
209 | After the team has completed a version of the software, they will release it to a testing environment. Here, the QA team and the developers will test all areas of the application to spot any defects, bugs, or other problems.
210 |
211 | ## Phase 5: Deploy
212 | At this stage, the team is confident it has fixed all defects and that the software has been built to the agreed-upon goals and specifications.
213 |
214 | Now it’s time to release the software to the production environment. This means the product will be generally available for customers to buy and use.
215 |
216 | ## Phase 6: Maintain
217 | With the software now live and being used by customers, the development team’s focus will shift to maintaining it.
218 |
219 | The developers will need to be ready to address requests for enhancements, bug fixes, and new features. These requests will come from many sources—sales, executives, customers—but the product management team will determine which of these initiatives make it onto the product roadmap for developers to work on.
220 |
221 | ## What are the Benefits of the Software Development Lifecycle?
222 |
223 | Software development teams find many advantages from using the SDLC model, including:
224 |
225 | #Lowering the cost of software development.
226 |
227 | Improving the quality of the software that the organization delivers.
228 | Shortening development timelines by preventing after-the-fact fixes.
229 | Helping developers better understand what they are building and why.
230 | Ensuring all stakeholders have a chance to give their input in the early stages of development.
231 | Giving everyone on the cross-functional team an understanding of the costs and resources needed to complete the project.
232 | Because the software development lifecycle model requires the development team to complete each phase before moving on to the next, it helps ensure problems don’t become compounded during the process. Using this approach helps teams identify and deal with problems immediately. This minimizes their impact on both the cost of the project and the quality of the final software product that the developers deliver to the market.
233 |
234 | However, the software development lifecycle model also has potential downsides. These drawbacks can particularly affect agile and lean development organizations, but their risks are relevant to any software company using the SDLC framework.
235 |
236 | ## What are the Drawbacks of the Software Development Lifecycle?
237 |
238 | # It reduces communication and collaboration across departments.
239 |
240 | Because SDLC is a linear model, and the organization does not advance to the next step until the current step is complete, this approach can have the effect of creating information silos.
241 |
242 | The engineering team is the only team focused on the project, for example, during the implementation phase. That means the QA or UX team could miss out on important learning during this phase because they are not all part of a cross-functional team in constant communication throughout the development process.
243 |
244 | # It is process-heavy and does not allow much flexibility.
245 |
246 | Another complaint about the SDLC model is that it can make an organization overly dependent on the process. A key principle in agile development is “people over processes.” This empowers an agile team to make quick adjustments to its plan when needed
247 |
248 | With the SDLC framework, this is more difficult because the team agrees early on to follow a specific development plan.
249 |
250 | # It creates a single point of failure in the early stages.
251 |
252 | The team sets the entire product-development plan according to the initial requirements-gathering and analysis. However, this first phase can lead to a failed product if the team doesn’t properly assess the market’s needs.
253 |
254 | With an agile approach, by contrast, the organization continuously reviews its product’s progress and seeks regular feedback from users. As a result, the team is less likely to build an entire product or significant new functionality without knowing there is a market for it.
255 |
256 | From the drawbacks listed above, it might seem that agile development teams would find the SDLC framework ineffective.
257 |
258 | But the SDLC framework can and often is incorporated into the agile development methodology. Agile organizations break the proposed product into small development cycles called sprints. In each sprint, they will work through all of these phases quickly.
259 |
260 | # How Does the Software Development Lifecycle Work with Agile Sprints?
261 |
262 | The typical agile sprint is only two weeks or a month. The team will start each sprint with a sprint planning session. At this time, the cross-functional team reviews the backlog. Then, they determine a few strategically advantageous projects to work on and assign tasks. They will then focus only on those projects and test their work at the end of the sprint. Finally, they will move on to the next sprint. Breaking up the process this way allows agile organizations to quickly and frequently release new functionality to the market. This frees them from having to wait to build an entire product before releasing anything.
263 |
264 | In other words, an agile organization can successfully adapt the SDLC framework to its development model.
265 |
266 | This is why any software organization, using any development methodology, can benefit from using some form of the software development lifecycle model.
267 |
268 |
269 |
270 | Buy this Book from Amazon.in :-
271 | The Complete Software Engineering from Basics to Advanced [Click For Book Purchage](https://www.amazon.in/Complete-Software-Engineering-Basics-Advanced/dp/B08NVJLGJ1 "The Complete Software Engineering from Basics to Advanced: Learn Software Engineering, SDLC, Software Project Management, Software requirements, Software Design Basics & more !").
272 |
273 | ## Book: The DevOps Handbook
274 | ## Course: Software Maintenance
275 |
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