Definition - What does Scalable Agile mean?
Scalable agile is an agile software development process that refers to the ability to manage large projects with multiple teams. Based on its conceptual framework, agile software development is often considered to not be scalable and only intended for small projects and teams.
Techopedia explains Scalable Agile
Agile is a type of software development that is based on increments and iteration. This is different from more traditional product development approaches that often involve having a more well-defined project that is documented, tested, and delivered with less modification of the requirements. Agile development allows businesses or developers to profit prior to completion of a project, and, through initial feedback, develop or enhance future features, ensuring value is provided to users.
Agile's scalability is a heated and debated subject. Many believe that agile development cannot be sustained when a project is large or multiple teams are involved. The flipside is that many open-source projects could be considered loosely agile given the iterative nature. What isn't up for debate is that thought needs to be put into the development process as teams get larger, but a developer's end opinion on the debate probably depends as much on their attitude to agile overall as anything. That is, if you hate agile, you probably don't think it's scalable, whereas if you can't wait for your daily scrum, you probably think it can be scaled without issue.