Software Development Lifecycle in 9 minutes!

Summary

This video script delves into the Software Development Lifecycle (SDLC), outlining its seven key phases: planning, requirement analysis, design, implementation and coding, testing, deployment, and maintenance. It emphasizes the critical role of testers and quality assurance analysts in identifying bugs and ensuring software meets requirements. The script also highlights the iterative nature of SDLC, where new features and requirements prompt revisiting earlier phases to enhance the application.

Takeaways

• 🔍 The Software Development Lifecycle (SDLC) is a process that encompasses the conceptualization, development, and maintenance of software.
• 📈 There are seven key phases in the SDLC: Planning, Requirement Analysis, Design, Implementation and Coding, Testing, Deployment, and Maintenance.
• 🤝 The customer initiates the process by outlining their business idea and requirements for the software application, working closely with the product owner or project manager.
• 📝 Requirement Analysis involves detailed planning and definition of each requirement with the collaboration of developers, product owners, and testers.
• 🎨 The Design phase includes planning the product's business rules, user interface, programming languages, frameworks, and system architecture.
• 💻 Implementation and Coding is where developers write code, designers finalize the UI, and testers prepare test cases, ensuring early detection of usability issues.
• 🔍 The Testing phase is crucial for identifying and fixing bugs before they reach production, safeguarding the software's quality and security.
• 🚀 Deployment involves setting up production environments, scaling resources, and preparing the application for live use by real users.
• 🔧 Maintenance is an ongoing phase where the application is monitored, supported, and updated to handle new user loads, fix bugs, and possibly introduce new features.
• 🔄 The SDLC is iterative; after maintenance, new features and requirements may lead to restarting the cycle to enhance the existing application.

Q & A

What is the Software Development Lifecycle (SDLC)?

The Software Development Lifecycle (SDLC) is the process by which software is conceptualized, developed, and maintained, encompassing planning, requirement analysis, design, implementation and coding, testing, deployment, and maintenance.

What are the seven key phases of the SDLC?

The seven key phases of the SDLC are: 1) Planning, 2) Requirement Analysis, 3) Design, 4) Implementation and Coding, 5) Testing, 6) Deployment, and 7) Maintenance.

Who is typically the initiator of a software project?

The initiator of a software project is usually the customer, who has the business idea and the funding to start the project.

What is the role of the product owner in the SDLC?

The product owner in the SDLC works with the customer to outline the requirements of the application and is responsible for creating tickets in a project management system based on the defined requirements.

Why is the testing phase considered crucial in the SDLC?

The testing phase is crucial because it ensures that all requirements have been met, functionality works as expected, and identifies bugs that could be critical if not caught before deployment.

What are the responsibilities of a tester during the testing phase?

During the testing phase, a tester is responsible for executing test cases, validating requirements, ensuring functionality, finding and reporting bugs, and working with developers to resolve these issues.

How does a bug tracking system work in the context of SDLC?

In the context of SDLC, a bug tracking system is used to report, track, and manage the life cycle of bugs. Testers report bugs, which are then assigned to developers for fixing, and once resolved, the issue is assigned back to the testers for verification.

What happens during the deployment phase of the SDLC?

During the deployment phase, the operations team prepares the production environment by mirroring the development setup, installing new hardware, setting up databases, and ensuring scalability and readiness for real users.

What is involved in the maintenance phase of the SDLC?

The maintenance phase involves monitoring and managing the application post-deployment, addressing production support issues, fixing bugs, and potentially scaling up resources to handle increased load or user numbers.

How does the SDLC handle new features and requirements after the initial release?

Once in the maintenance phase, new features and requirements are introduced, which can restart the SDLC process to incorporate these changes into the existing application.

Outlines

00:00

📈 Understanding the SDLC Process

This paragraph introduces the Software Development Lifecycle (SDLC), which is a process that encompasses the conceptualization, development, and maintenance of software. The SDLC consists of seven key phases: planning, requirement analysis, design, implementation and coding, testing, deployment, and maintenance. The paragraph also describes the initial interaction between the customer with a business idea and the tech company, leading to the project acceptance by the company's product owner or project manager. The customer and product owner then outline the application's requirements, which are further detailed in subsequent phases of the SDLC.

05:02

🔍 Deep Dive into SDLC Phases

The paragraph delves into the specifics of each SDLC phase. It starts with requirement analysis, where the team defines and plans the application's features. The design phase involves planning the product's aspects such as business rules, user interface, and technical architecture. The implementation and coding phase is where developers write code, designers finalize the UI, and testers create test cases. The testing phase is highlighted as crucial for identifying and fixing bugs before they reach production. The deployment phase is about preparing the production environment, and the maintenance phase involves ongoing support and updates to the application. The paragraph concludes by emphasizing the cyclical nature of the SDLC, where new features and requirements can trigger another cycle.

Keywords

💡Software Development Lifecycle (SDLC)

The Software Development Lifecycle (SDLC) is a structured process used to develop, maintain, and test high-quality software. It is the central theme of the video, outlining the seven key phases: planning, requirement analysis, design, implementation and coding, testing, deployment, and maintenance. The SDLC ensures that all aspects of creating software are systematically addressed, from conceptualization to delivery and ongoing support.

💡Requirement Analysis

Requirement Analysis is a phase within the SDLC where the team meets to define each requirement of the software in detail. It is crucial for understanding what the software needs to do and how it should function. In the script, requirement analysis is exemplified by discussing user registration, login, logout, and the dashboard, which are essential features of the invoice application being developed.

💡Design Phase

The Design Phase of the SDLC involves planning the product's structure, including business rules, user interface layouts, color schemes, programming languages, frameworks, server design, and database relationships. It is about translating the requirements into a blueprint for the software. The video mentions that the design phase may include decisions on the architecture of the application and considerations for mobile aspects and supported browsers.

💡Implementation and Coding

Implementation and Coding is the phase where developers write the actual code to build the software, following the designs and requirements established in previous phases. This phase is where the software starts to take shape and become functional. The video script describes how the operations team sets up the hardware and servers, while developers write the code to create the application.

💡Testing Phase

The Testing Phase is critical for identifying and fixing bugs and ensuring that the software meets all the defined requirements. Testers execute test cases and validate functionality. The video emphasizes the importance of this phase by illustrating a scenario where a logout feature doesn't work correctly, which could lead to serious security issues if not caught during testing.

💡Deployment

Deployment is the phase where the software is prepared for production use. This involves setting up the necessary hardware and software infrastructure to support the application. The video describes how the operations team mirrors the development environment for production, ensuring that the application is scalable and ready for real users.

💡Maintenance

Maintenance is the final phase of the SDLC, where the software is continuously supported and updated. This includes monitoring server load, addressing bugs found in production, and potentially scaling up resources to handle increased user demand. The video mentions that maintenance is an ongoing process, where new features and requirements may lead to restarting the SDLC for further development.

💡Product Owner

A Product Owner is a key role in the SDLC, typically responsible for managing the product requirements and working closely with the customer to ensure the software meets their needs. In the video, the product owner is depicted as the liaison between the customer and the development team, helping to outline and define the application's requirements.

💡Test Cases and Test Plans

Test Cases and Test Plans are documents created by testers to guide the testing process. Test cases are detailed scenarios that define how a particular feature should work, while test plans outline the overall strategy for testing the software. The video script mentions that testers build test cases for their test plans, which are then used to execute tests and find bugs in the application.

💡Bug Tracking System

A Bug Tracking System is a tool used to manage and track software defects or bugs. When testers find a bug, they report it in the system, where it is assigned to a developer for fixing. The video script describes a bug lifecycle where bugs are reported, fixed, and then reassigned to testers for validation, ensuring that issues are resolved before the software is released.

💡Iteration

Iteration refers to the process of repeating the SDLC phases to refine and add features to the software. The video script mentions that throughout the course, multiple iterations of the SDLC will occur, with new requirements and features being added in each cycle. This iterative approach allows for continuous improvement and adaptation to changing needs.

Highlights

Introduction to the Software Development Lifecycle (SDLC) process

Seven key phases of the SDLC: Planning, Requirement Analysis, Design, Implementation & Coding, Testing, Deployment, and Maintenance

The role of the customer in conceptualizing the software and initiating the project

Engagement of the product owner or project manager in the planning phase

Collaboration between the customer and product owner to outline application requirements

Iterative approach to SDLC with new requirements and features added in each cycle

Requirement Analysis phase involving the whole team to define each requirement in detail

Design phase includes planning for business rules, user interface, programming languages, and system architecture

Implementation and Coding phase where developers write code and testers build test cases

Testing phase's criticality in identifying and preventing bugs before deployment

The tester's role in imagining application usability and identifying fundamental flaws early on

Deployment phase involves setting up production environment and preparing for real user traffic

Maintenance phase focuses on server monitoring, load management, and addressing production support issues

The cycle of bug identification, reporting, fixing, and redeployment in the maintenance phase

The continuous nature of SDLC with new features and requirements leading to repeated cycles

Importance of the testing phase in ensuring security and functionality of the application

The interplay between development, testing, and deployment in the SDLC process

Transcripts

in order to understand what a software

tester or quality assurance analyst does

you first need to understand the process

by which the software is conceptualized

developed and maintained

this process is known as software

development lifecycle or the sdlc

there are seven key points to

understanding the software development

life cycle

phase one planning

phase two requirement analysis

phase three design

phase four implementation and coding

phase five testing phase 6 deployment

and phase 7 maintenance

[Music]

so it all starts with this guy the

customer

he's the guy that has the business idea

for our invoice application and the

money to get it started

he's going to reach out to multiple

different tech companies until he finds

one that he likes

finally he's going to meet our company's

product owner or our project manager

they're going to discuss terms of their

agreement sign a deal and accept the

project

this will move us into the next phase

planning the requirements

together the customer and the product

owner will outline the requirements of

the application

let's imagine that the requirements that

they've both agreed upon are as follows

one user registration

two

login

three

log out

four

the dashboard landing page

and so on and so forth

throughout this course we'll be running

multiple iterations of the sdlc to which

new requirements and new features will

be added

now that we have the outlined

requirements let's take them and move on

to the requirement analysis phase

here's our team operations developers

product owners and testers

we'll all meet up at an office for a few

hours and define each outlined

requirement and give more planning

details

let's start with requirement number one

user registration we'll need a username

input field a password field a check box

to accept the terms and conditions

a submit button

and the ability to save the user into

our database

then we'll move to requirement number

two the login

we'll need a login page to allow

returning users to log back into our

system

for this we need another username input

field

a password field along with another

submit button

from this we'll need to read the user's

information out of the database and log

them into our system

requirement number three will require a

logout button usually located around the

same area where the user was logging in

from when they press the logout button

it should clear their session out of the

browser to prevent other people from

returning and logging back into their

account

finally requirement number four the

dashboard this will essentially be the

home page of our application

after a new user is registered they

should be redirected to the dashboard

also when the user logs in with the

returning account they should be

redirected to the dashboard

for our first sdlc i will keep the

requirements easy in upcoming videos

we'll dive further in with much harder

customer requirements

once all of the requirements have been

analyzed by the team and defined

the product owner will take all the

defined requirements and create tickets

in a project management system

from here we'll move into the design

phase of the sdlc

the design phase takes all the

requirements and starts to plan the

product

the design phase may include the

business rules

the user interface layouts

color schemes

what programming languages to use

frameworks

system server design

database relationships

architect of the application

mobile aspects

supported browsers

and much more

next we'll discuss the implementation

and the coding of the application

the implementation and coding phase is

where everything starts to become fun

the operations team will set up the

physical hardware for the servers the

developers will start writing the code

the designers will continue planning the

user interface

and the testers will analyze the

requirements and start building test

cases for their test plans

even in this stage testers are

incredibly valuable they start to

imagine the usability of the application

and see how everything flows together

sometimes while writing test cases they

can discover things don't make sense and

help redesign fundamental flaws in the

early stages of the application

next up we'll be discussing one of the

most important phases which is the

testing phase

so why is the testing phase so important

imagine that the developer has finished

coding some of our new features in our

requirements we found that when the user

logs out

that it's not actually clearing the

session in the browser

and that another

person can walk up to their computer

click the login button or click the

refresh on the page and they gain access

to their account

get access to all of their money and

start making payments on various things

they'd be huge and expensive terrible

bug that would get released if we didn't

have testers to test these types of

things beforehand

so what does a tester actually do during

the testing phase

[Music]

now that we have the servers all set up

and the database is set up developers

have finished coding they've given us an

application an actual website that we

can log into now

now we can start testing and executing

our test cases from the test plans that

we've created

validate that all of the requirements

have been met

make sure all the functionality is

working as expected

find as many bugs as we possibly can

which could be color scheme is incorrect

or there's a user interface bug

somewhere the critical issue people not

being able to log out maybe the users

can't even register there's so many

mistakes that developer can make and do

make frequently

so as we're testing we start to find

bugs and what we'll do is we'll report

them into a bug tracking system which is

then assigned to a developer

they'll go in and they'll fix the bug

fix the issue and assign it back to us

this is called a bug of life cycle you

may have noticed that i've mentioned

test cases test plans

and bugs

in the upcoming videos we'll go into the

bug life cycle

iterating with developers

and how to write test plans and test

cases

up next we'll talk about the deployment

phase

the deployment phase the operations team

will end up mirroring the staging or

development environment systems that

we've been testing in and get them ready

for production meaning that they'll

install new hardware brand new servers

have everything scalable for production

this includes setting up the links

setting up the databases for real users

syncing up with the development teams

and release managers

once they've completed all of these

tasks our application will go live to

real users

this brings us to the final phase of the

sdlc

maintenance

so imagine that we've released and our

application became so successful we're

just getting millions of users logging

in and registering and using this

application

so we need to maintain

the servers in the environment they need

to monitor the load the stress

everything coming on the servers by so

many users logging in and using it it

doesn't bring down the system maybe we

need to make larger servers larger

databases maybe we need to get faster

computers there's a lot of stuff that

goes under in the maintenance phase

there will be bugs found in production

it's called production support

frequently users will email with their

issues and you can stop and investigate

what they're complaining about or what

their issue is

figure it out

write up a bug

get it resolved and do another

deployment to production with issues

fixed

so to summarize we've discussed planning

requirement analysis design

implementation and coding testing

deployment and maintenance

all right awesome that wraps up the

video on the sdlc

one last thing to say is once we're in

the maintenance phase new features will

come through new requirements will come

through and we'll restart the whole

process again and be able to get new

stuff added into our existing

application

[Music]