SDLC methodologies

7 SDLC methodologies that every Application Security Engineer should know – Part 2

Software Development Life Cycle (SDLC) is a well-planned process that leads the software development team through the different phases of software development. SDLC has several methodologies which guide the professionals through their project-based task.

The first part of the series dealt with three major SDLC methodologies, and this second blog will introduce you to the next four crucial SDLC models.

Common Yet Advanced SDLC Models

An SDLC process consists of a detailed plan to develop software that transitions through six phases: requirement, design, development, testing, deployment, and maintenance. For developing cost-effective software within the minimum delivery time, check out the listed SDLC models.

V-Model Software Development Life Cycle

The V-Model SDLC is also known as the Verification and Validation model. The processes occur sequentially in a V-shape. It is an extended form of Waterfall model with each development stage associated with a testing phase. V-model is a highly disciplined model, and as being similar to the Waterfall model, the development team needs to complete each phase successfully before jumping onto another.

Pros of V-Model SDLC

Cons of V-Model SDLC

  • Phases completion occurs one at a time, making it a highly disciplined model.
  • Best suited for smaller projects with all-known requirements.
  • It is easy to understand and adopt.
  • Each phase consists of a separate review process and expected outcome.
  • It is an uncertain and risky model.
  • The model does not support complex and object-oriented projects.
  • It also not suitable for long and continuously changing projects.
  • After reaching the testing phase, no extra functionality can be added to the project.

Agile Software Development Life Cycle

It is a combination of iterative and incremental SDLC models, but it concentrates on process adaptability and customer satisfaction. To fulfill the second objective, the model aims to achieve quick product delivery. Under this model, the product is disintegrated into small incremental builds. All these builds go through iterative processes. The time required to complete an iteration is about one to three weeks.

Pros of Agile SDLC

Cons of Agile SDLC

  • It follows a realistic and very practical approach to software development.
  • It demands teamwork.
  • The creation and demonstration of functionalities are rapid.
  • This model requires limited resources.
  • It best suits both the ever-changing as well as fixed projects.
  • It has an easy documentation process with minimum rules and protocols.
  • No exaggerated or detailed planning required.
  • It offers a high degree of flexibility.
  • The model can’t handle complex dependencies of one process over another.
  • It is a risky methodology in terms of sustainability and extensibility.
  • Without the involvement of Agile leader and Agile project management (PM), the model won’t work.
  • As it majorly focuses on delivery management, other factors depend on it: scope, functionality, and the adjustments of the project.
  • Highly dependent on customer interaction. If the wrong direction followed, the result wouldn’t meet the expected outcome.

Prototyping Software Development Life Cycle

The design team aims to produce an early model of the project with limited functionalities. The prototype does not contain the complete functionality or go through harsh testing; it just gives an overview to the clients about what to expect. Their response or feedback helps in the betterment of the developing software. The reason behind its increasing popularity is the understanding of customer requirements at the initial stage of software development.

Pros of Prototyping SDLC

Cons of Prototyping SDLC

  • It presents a better way of involving users (before developing the final product).
  • The user gets a better idea of what to expect as the end product.
  • Less time-consuming and highly cost-effective as the detects can be detected in early stages.
  • Client feedback leads to the betterment of the final outcome.
  • Additional or missing functionalities can be detected during software prototyping.
  • High dependency on the prototype.
  • The prototype can confuse the client regarding the final product.
  • This approach can increase the scope of the project beyond the original plan.
  • Reusing the developed prototype for another project might not lead to a technically feasible option.
  • If the efforts invested in developing a prototype is not monitored properly, it could go to waste.

RAD Software Development Life Cycle

The RAD (Rapid Application Development) methodology consists of prototype and iterative models without any specific plan. Under this model, the code writing process is included in the software development plan. The client requirements are gathered at various stages of the software development life cycle, including early prototype testing, reuse of the components of the prototype, or through workshops. The model allows continuous integration at a rapid delivery pace.

Pros of RAD SDLC

Cons of RAD SDLC

  • Changes in requirements can be integrated into the project.
  • Software development progress can be easily evaluated.
  • With the use of powerful RAD tools, the iteration time can be shortened.
  • Faster delivery time.
  • Possibility of reusing prototypes or components of a prototype
  • Reliable customer feedback.
  • Team members should have technical as well as other skills to identify the business requirements.
  • Highly dependent on prototyping skills.
  • Expensive because of the involvement of prototyping and auto-code generation.
  • It suits the products that require scalability and are component-based.
  • It needs user involvement throughout the software development life cycle.

SDLC is a standard process of designing, developing, testing, and maintaining software. It focuses on developing cost-effective software within the best time possible. The SDLC models covered in the first part of the series are basic, while the above-listed ones suit a wide range of projects and ensure the shorter delivery time. The software development team follows the chosen model for developing high-quality software. For that, the team members must possess the required skills to develop software using secure SDLC. They should also be well-versed with various secure coding practices like input validation, cryptography, session management, and several others. Employ a professional holding Certified Application Security Engineer (C|ASE) credential. The program not only imparts comprehensive theoretical knowledge but ensure that the attendee gains all the required technical skills that could be put to immediate use.

Don’t forget to check out the most dangerous web application attacks that can impact your organization negatively.

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