The result of a well-coordinated team effort is a product or software:
Software Development Life Cycle (SDLC) describes the key stages of the software creation process. The earlier a QA engineer detects bugs, the cheaper they are to fix.
Example: launching online payment in a pizza delivery service
The team wants users to choose a pizza and pay for the order by card.
The team decides why online payment is needed, sets the launch timeline, assigns owners, and identifies key risks such as payment provider outages.
We describe payment rules: when to show the button, which card data to validate, and what to do after a bank decline, repeated click, or empty cart.
We prepare mockups for the cart, payment form, success and error screens, and Paid status.
Developers add the payment button, payment provider integration, order status saving, and handling for approved or declined payments.
QA checks successful payment, bank decline, invalid card data, double-clicking the button, empty cart, mobile layout, and order status after payment.
After the release, the team watches complaints, log errors, and disputed orders: fixing cases where money was charged but the order was not created.
Development models show how a team moves through SDLC stages: sequentially from idea to release, or in short cycles with regular improvements.
Waterfall Model is an approach where stages move one after another: requirements and design first, then development, testing, and release.
Agile Model is an approach where the team works in short iterations, regularly shows working versions, and adjusts next steps based on feedback. Scrum is one way to organize this work in sprints.
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