INVEST principle of User stories is acronym for User stories being Independent, Negotiable, Valuable, Estimable, Small and Testable.

Agile Development
Total Quality Management (TQM) is a management technique based on the idea that all “employees continuously improve their ability to provide on-demand products and services that customers will find of particular value.”
Rather than relying on a top-down direction from a project manager, Agile Scrum teams are self-organizing, collaborating and communicating as a group to drive work forward and decide what to focus on next.
Scrum is a popular Agile methodology that has been widely adopted by software development teams to manage their projects. However, despite its widespread use, it has been observed that Scrum can often fail in large companies.
Scrum is the most popular Agile framework you can use to address complex problems. It’s something to seriously consider in the world of dynamically changing environments and requirements, as it ensures the best use of your time and resources.
Agile software experts tend to describe phase gate processes as obsolete or inherently “waterfall” and therefore evil — but this is more a reflection of how poorly the Agile coach understands the nature of product development outside of software.
Scope creep is not something to be feared — it is something to be removed from the equation. Fortunately, the process by which you can be confident of avoiding scope creep also enables you to provide a top-quality service for the client in terms of assessing their needs and providing a solution that should deliver to a more than satisfactory standard.
Why does adding more people to a late project make it later?
Let's walk through the potential pitfalls and critical mistakes to avoid when outsourcing software development.
A proof of concept (POC) is a demonstration of an idea or service to verify its feasibility. It's the ability to show or prove that something actually works.