When developing software, selecting a reliable software process model is a vital task.

Software development models function as the primary pillars for assuring the application’s quality, performance, and stability. It helps the project teams determine the core processes and efficiently support completing them.

If you are currently working or want to make your career in the development domain, you must have a clear insight into software engineering models and methods.

Let’s get started and learn about types of SDLC and their processes.

Why do we need a Software Process Model?

If you don’t use an SDLC model, there can be a probability of missing something. So, let’s understand the need for software engineering models and methods and how they help us.

  • We learn about the crucial steps for building a secure, scalable, and robust application aligned with industry standards.
  • It helps assess the project cost and time and minimize the business and technical risks in the future.
  • Leads to cover the edge-to-edge requirements and assures of constructing a top-notch application.
  • It improves the collaboration between the project team and all the stakeholders.
  • It makes the designing, development, testing, and maintenance operations seamless, stable and smooth.
  • Both client and project team understand the scope of creating the application accurately.

Understanding the Basics of Software Development Models

We know the benefits and needs of aligning projects according to software engineering models and methods.

There are various types of SDLC models available, which you can select at your convenience. Still, before that, you should know the basic steps every model includes, and you should consider them for every project.

Step 1: Requirement Gathering and Analysis

The first step associated with any software process model is to collect the business requirements, focusing on the essential and most fundamental information.

Every detail you gather at this stage is essential, as it helps to make relevant decisions about the project, such as complexity, technology to be used, time-to-market, and so forth. In addition, you can precisely understand the risks affecting the quality of the software.

By focusing on requirement collecting, you can plan the development precisely and effectively, minimizing risk and assuring a cutting-edge solution.

Step 2: Generating Scope, Business, and Technical Goals

After collecting and assessing all the data, you have to create a project scope, which should define, what will be your final product or output at the end of this software development model.

In this stage, you will describe the functionalities of your application, including both backend and frontend. As a result, an SRS, formerly a Software Requirement Specification document, will be created and shared with the client for approval.

The client will verify the application details by reviewing the SRS, and the development team will use it for their internal purposes.

Step 3: Scheduling and Planning

When the client finals all its requirements, you have to create a project plan for an efficient roadmap to complete the project before the deadline.

You have to perform all the resource, cost, and time-related analysis at this step only; otherwise, your project can face non-preventive risks in the future. Once you are done with all the planning and ready with your project charter and other crucial plans, you can initiate the designing phase.

Step 4: Designing

In this stage of SDLC, multiple software designs are drafted, including the interface and architectural designs. In addition, the development team creates a Design Document Specification for further help.

This vital document lists all the details about fabricating modules and overall architecture. Once the designing team specifies all the aspects by curating wireframes, prototypes, and mockups, you can move your project to the development phase.

Step 5: Development and Testing

It is the building stage of your software and one of the most key processes. The software development team utilizes all the applicable documents, wireframes, and technologies for innovating a top-notch business application, which must align with the organization’s guidelines.

Interestingly, DDS plays a significant role at this step. Detailed design documentation can aid the software developers and architects in smoothly executing the operations and rapidly conclude a best-in-class software.

Once the software engineers create the application, testers come into the role and check the functionality and security to ensure there are no vulnerable loopholes, glitches, and errors. After thoroughly testing the app, the client gets its application delivery.

Step 6: Maintenance and Support

Monitoring, testing, fixing, and maintaining the software are post-development operations, which are highly necessary for every project.

The primary objective of this phase is to undergo application through user acceptance testing and verify whether all the functions are properly working or not. Moreover, the company assesses whether the users are ready to adapt the software or not.

As a result, the project team tries to eliminate the drawbacks and correct the software for the final release. When the software is finally active and live, the support team continuously monitors it and ensures its seamless functioning and quality of service.

A Deep-dive into the Types of SDLC: Software Development Models with Examples

Waterfall Model

The waterfall is the most basic and earliest software development model, invented and introduced to the public between the 1950s and 1970s.

It is a straightforward approach, comprising of only the fundamental steps associated with any SDLC, namely as:

  1. Requirement Gathering and Planning
  2. Designing
  3. Development
  4. Testing
  5. Software deployment
  6. Maintenance and Support

Waterfall Model

From the name Waterfall, you can easily understand that it is sequentially linear, meaning you can’t escalate the project to the next step until the current phase is in an active state.

For example, if you collect information from the stakeholders in the first step, you cannot initiate the designing phase until you have documents containing all the details. In simple terms, the output of one phase functions as an input for the upcoming one.

Pros Cons Relevant for Project Having
 Having starting and endpoints makes it easy to manage. A little-bit slow-moving process. Well-defined outcomes
 Business and Technical requisites are clearly understood. Not compatible with large projects. Freshers and experienced team members
 The tester creates multiple test cases to remove every kind of error. It prevents the app from adding new features in-between the development phase. Scope of building a simple application
Documents created throughout the lifecycle help the team during and after development.  You can’t go back to the previous stage
Very inflexible

V-Model

V model is an advanced version of the Waterfall software development model with testing associated with every phase.

Its name V model is derivated from the Validation and Verification processes. These are also the two primary objectives of using this approach. Every testing included in this model verifies the software as per the requirements validated by the clients.

V Model

As we have seen in the waterfall model, you can’t move further without completing the current phase, and the same is the case with the V-model. For example, you can only move ahead from the architecture development phase when the integration testing results verify the project scope and goals.

Pros Cons Relevant for Project Having
Risks and defects in the software are easily discoverable in the initial stages. Inflexible, cannot embed changes Fixed requirements
Flawlessly understandable Modifying the scope can lead you to expand the budget and increase complexities. The target of producing a small and medium scale application
Easy to maintain and implement It takes more time for software development than other software development models. Experts with experience in furnishing similar projects
Saves time, cost, and resources
The team can complete both verification and validation of the app
Assures higher probability of success

Spiral Software Model

Spiral is one of the most flexible SDLC models, and experts are highly considering it for developing large-scale and complex applications through its modular approach.

The waterfall and prototype model features assure the seamless execution of the overall procedure and guarantee the desired application as the final result.

Spiral Model

A significant benefit of this model is its risk identification and resolve phase, which helps discover potential threats that can affect the cost, time, quality, and other project resources and KPIs. Once you align your application development with the spiral model, it will continually revolve around its four significant stages for resolving all the risks.

For example: If you are at the beginning of your project and following the spiral model. Then, you will first define the objective analyze it to find and resolve risks. Further, start with design, development, and testing.

And, if you discover any new thing, you will shift your project to the 4th stage, known as planning the next phase. Only the spiral will end when you and your client are satisfied with the application.

Pros Cons Relevant for Project Having
Optimized risk management for handling both business and technical threats The team can struggle in maintaining budgets and timeline Extensive budget and flexible time-to-market
Cost estimation facilitation Increase in efforts due to intermediate phases Dynamic and complex requirements
Faster development along with customer feedback and suggestion Additional resource requirements for managing risks Large scale software production
Integration of new features in half of the development process

Agile Model

You must have heard about this SDLC mechanism very often. IT firms prefer Agile for software projects, but other industries adapt their methodologies to provide quality work to their clients.

The fundamental steps involved in software engineering models allow creating multiple iterations, which leads to developing the software fulfilling all the requirements. Each iteration executed in this process requires both team and stakeholders to engage and collaborate effectively.

For Example: Once you are at the development stage and the user interface is ready. You share the interface with stakeholders, and some changes are there. It will lead you to initiate that UI development iteration again.

That’s how iterations work in the Agile SDLC model.

Agile Model

In addition, as per the industry data, Agile reduces development cost up to 42%, increases customer satisfaction by 49%, shortens time-to-market by 43%, and enhances the software quality by 52%.

Pros Cons Relevant for Project Having
Budget constraint is no longer there for introducing new business demands Only experienced people can work on such projects, increasing the budget. Probability of new changes every week
Saving of time and resources due to less documentation High risk of failure, if stakeholder requirements are constantly changing Briskly moving market
All the stakeholders actively participate New development niche
Issues are impeccably identified and mitigated
High-quality software is assured

DevOps Model

DevOps is the new and latest entry in software development models. The application development team and operations teamwork collaborate with this model to reduce the timeline and innovate a robust application.

The primary aim of this model is to make the overall process consistent and reduce the risks post-delivery of the solution.

With the growing industry needs and urgent need for business-oriented applications, the demand for DevOps experts is immensely breaking the bracket. And, it is expected that by 2026, it will be the most appraised SDLC model.

Pros Cons Relevant for Project Having
Quick and comfortable integration of all the changes Professionals with multiple skills are its basic necessity A shorter time-to-market
Easy to maintain and manage software Elimination of traditional work culture Extensive configurations and implementations
Shortening of time-to-market up to 45% Compatibility issues Objective to achieve speed, scalability, and robustness
Better collaboration, leading quality results

Incremental Model

The fundamental idea of developing this model comes from modernizing the waterfall approach by linking it with an iterative process.

This software process model comprises multiple mini waterfalls to fabricate the business solution and ensure that all the client demands are met.

For example, suppose you are furnishing a large and complex application. In that case, developers will split the overall procedure into small iterations, and in each iterative circle, they will follow the waterfall model.

Every time you start an iteration, you have to follow all the stages included in the waterfall model.

Pros Cons Relevant for Project Having
You can quickly meet client changes Expensive for small-scale projects Immense size and more difficulties
Design flaws are discovered and resolved in the initial phases The requirement of additional resources can affect the workflow The expectation of changes in future
Improves the financial, human, and time resource evaluation Elevation of design and development issues due to incomplete requirement gathering

Summing Up

There are numerous SDLC models available in the market, and you can choose any from them according to your project size and business requirements. Every model has its guidelines, pros, cons, and suitability for different software projects.

Once you understand the fundamentals of the software development life cycle, you can quickly implement any model and ensure the success of your business software. In addition, as per the evolving industry, you must go for picking out Agile and DevOps methodologies, as these two are the most flexible and expert preferred models.

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