Software Development Life Cycle: Phases, Methodologies, Procedure, Models

What is Software Development Life Cycle?

The Software Development Lifecycle is a precise procedure for structure programming that guarantees the quality and accuracy of the product software. SDLC procedure intends to create amazing software which meets client desires. The software development ought to be finished in the pre-characterized time span and cost.

The product advancement life cycle (SDLC) is a framework characterizing errands performed at each progression in the software improvement process. SDLC is a structure pursued by an advancement group inside the product association.

The life cycle defines a methodology for improving the quality of software and the overall development process. The software development life cycle is also called as the software development process.

In this Software Development Guide tutorial, you will learn

SDLC Phases

The entire SDLC process divides into the following phases:

Phase 1: Requirement analysis and Planning
Phase 2: Define Requirements
Phase 3: Design:
Phase 4: Building or Coding the Product:
Phase 5: Testing:
Phase 6: Maintenance:

Phase 1: Requirement Analysis and Planning

Requirement Analysis and Planning primary phase in the SDLC procedure. It is led by the senior colleagues with contributions from every one of the partners and space specialists in the business. Getting ready for the quality affirmation necessities and recognization of the dangers included is additionally done at this stage.

This information is then used to plan the basic project approach and to conduct a product feasibility study in the economical, operational and technical areas.

After the requirements are accumulated from the customer, an extension record is made in which the extent of the task is resolved and archived.

This phase gives a more clear image of the extent of the whole venture and the foreseen issues, openings, and orders which set off the task.

Phase 2: Define Requirements

When the requirement investigation is done the following phase is to plainly characterize and report the item necessities and get them affirmed from the client or the market examiners. This is done through an SRS (Software Requirement Specification) report which comprises of all the item necessities to be planned and created during the undertaking life cycle.

Phase 3: Design

SRS is the reference for product planners to turn out with the best engineering for the item to be created. In light of the prerequisites determined in SRS, generally, more than one structure approach for the item engineering is proposed and recorded in a DDS – Design Document Specification.

This DDS is evaluated by all the significant partners and dependent on different parameters as hazard appraisal, item heartiness, structure particularity, spending plan, and time limitations, the best plan approach is chosen for the item.

There are two types of reports design in this phase:

High-Level Design (HLD)

  1. Brief depiction and name of every module
  2. A diagram about the usefulness of each module
  3. Interface relationship and conditions between modules

Low-Level Design(LLD)

  1. The useful rationale of the modules
  2. Database tables, which incorporate sort and size
  3. Complete detail of the interface

Phase 4: Building or Coding the Product

When the framework design phase is finished, the following stage is Building or Coding the Product. In this stage, designers begin to manufacture the whole framework by composing code utilizing the picked programming language.

In the coding stage, undertakings are isolated into units or modules and allocated to the different designers. It is the longest period of the Software Development Life Cycle process.

The programming code is produced according to DDS during this stage. On the off chance that the structure is performed in a definite and sorted out way, code age can be cultivated absent much issue.

Developers must pursue the coding rules characterized by their association and programming apparatuses like compilers, translators, debuggers, and so forth are utilized to create the code. Diverse abnormal state programming dialects, for example, C, C++, Pascal, Java, and PHP are utilized for coding. The programming language is picked concerning the sort of programming being created.

Stage 5: Testing the Product

This stage is typically a subset of the considerable number of stages as in the cutting edge SDLC models, the testing exercises are for the most part associated with every one of the phases of SDLC. Notwithstanding, this stage alludes to the testing just phase of the item where item imperfections are accounted for, followed, fixed and retested until the item arrives at the quality gauges characterized in the SRS. This is the process of finding issue or error in the created software.

The testing experts team begins testing the usefulness of the whole framework. This is done to check that the whole application works as indicated by the client prerequisite.

During this stage, QA and testing experts team may discover a few bugs/error which they impart to engineers. The improvement group fixes the bug and send back to QA for a re-test. This procedure proceeds until the product is sans bug, stable, and working as indicated by the business needs of that framework.

Phase 6: Maintenance

When the item is tried and prepared to be conveyed it is discharged officially in the suitable market. Now and again item sending occurs in stages according to the business procedure of that association. The item may initially be discharged in a restricted section and tried in the genuine business condition (UAT-User acknowledgment testing).

When the framework is sent, and clients begin utilizing the created framework, following 3 exercises happen

  1. Update – Upgrading the application to the more up to date forms of the Software
  2. Upgrade – Adding some new highlights into the current programming
  3. Bug fixing – bugs are accounted for as a result of certain situations which are not tried by any stretch of the imagination

SDLC Models

Following are the most important SDLC models followed:

  1. Waterfall Model
  2. Iterative Model
  3. Spiral Model
  4. V-Model
  5. DevOps
  6. Lean
  7. Agile

Waterfall Model

This model includes completing each stage totally before initiating the following one. At the point when each stage is finished effectively, it is looked into to check whether the task is on track and whether it is practical to proceed.

In this methodology, the entire procedure of product improvement is separated into different stages. In this SDLC model, the result of one stage goes about as the contribution to the following stage.

Incremental Model

This life cycle model includes different advancement cycles. The cycles are split into littler emphases. This emphasizes can be effectively overseen and experience a lot of stages including prerequisites, structure, execution, and testing. A working adaptation of the product is delivered during the main emphasis, so working programming is made from the get-go in the advancement procedure.

The SDLC procedure is rehashed, with each discharge including greater usefulness until all prerequisites are met. In this technique, each cycle goes about as the upkeep stage for the past programming discharge. Adjustment to the gradual model permits improvement cycles to cover. After that resulting cycle may start before the past cycle is finished.


This model spotlights on the execution of procedures in a consecutive way, like the cascade model however with more significance put on testing. Testing techniques are composed even before the initiation of composing code. A framework plan is created before beginning the advancement stage.

SDLC model testing and the advancement, the stage is arranged in parallel. In this way, there are confirmation stages as an afterthought and the approval stage on the opposite side. V-Model joins by Coding stage.

Spiral Model

The winding model is a hazard driven procedure model. This SDLC model encourages the group to receive components of at least one procedure models like a cascade, gradual, cascade, and so on. This model embraces the best highlights of the prototyping model and the cascade model. The winding approach is a mix of quick prototyping and simultaneousness in plan and improvement exercises.


DevOps is one of the most current SDLC strategies and is being embraced by numerous product organizations and IT associations. As its name proposes, the reason of DevOps is to unite improvement groups with operational groups so as to streamline conveyance and backing.

The upsides of such a methodology are, that changes become progressively liquid, while the hierarchical hazard is decreased. Groups must have adaptable assets all together for a DevOps course of action to succeed.


The nimble and lean methodologies are firmly interconnected, as the two of them center around conveyance speed and nonstop improvement. Conversely, the lean model is established in assembling best practices where abundance waste and exertion are viewed as the biggest hazard to an association.

With regards to programming and ventures, the lean SDLC procedure centers around decreasing waste in each stage, including booking, cost, and degree. This methodology is most convincing for associations with exacting equipment prerequisites and other obtainment needs.


The spry procedure is something contrary to the cascade approach. Instead of treating necessities, structure, and testing as huge consecutive advances, a nimble model makes them every progressing procedure that requires inclusion from designers, the board, and clients.

Work is normally broken into 2-multi week portions known as “runs,” in which the mindful groups handle the real needs of their clients and perform testing as they go. Coordinated will in general function admirably in little associations, particularly new businesses, where speed and adaptability are fundamental.


In the prototyping strategy, the structure group’s center is to create an early model of the new framework, programming, or application. This model won’t have full usefulness or be completely tried, yet it will give outer clients a feeling of what’s to come. At that point, the input can be accumulated and actualized all through the remainder of the SDLC stages.

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