The term "Agile" in the context of software development was coined in February 2001, during a meeting of software developers in Snowbird, Utah. This meeting led to the creation of the Agile Manifesto, which outlined a set of guiding principles for agile software development.

The Agile Manifesto was authored by a group of prominent figures in the software development community, including Kent Beck, Ward Cunningham, Martin Fowler, Ron Jeffries, and others.

The manifesto emphasized values such as individuals and interactions over processes and tools, working software over comprehensive documentation, customer collaboration over contract negotiation, and responding to change over following a plan.

Since its introduction, the Agile Manifesto has had a significant impact on the software development industry, leading to the adoption of agile methodologies such as Scrum, Extreme Programming (XP), Kanban, and others. These methodologies prioritize flexibility, adaptability, and customer satisfaction, allowing teams to respond quickly to changing requirements and deliver value incrementally.

The Scaled Agile Framework (SAFe) was introduced in 2011 by Dean Leffingwell. Leffingwell, a recognized authority in the field of software development methodologies and scaling agile practices, developed SAFe as a framework to help organizations scale agile principles and practices beyond individual teams to larger enterprises.

SAFe provides a structured approach for implementing agile at scale, incorporating principles from lean thinking, systems thinking, and agile development. It addresses the challenges associated with coordinating the efforts of multiple teams working on complex projects within large organizations.

Since its introduction, SAFe has gained popularity and is widely used by organizations around the world to facilitate enterprise-wide agile transformations. SAFe has also evolved over time with regular updates and revisions to accommodate changing industry needs and best practices.

Agile and the Scaled Agile Framework (SAFe) share some common traits, but they also have distinct characteristics. Here's a comparison of the traits of Agile and SAFe:

Traits of Agile:

1. Individuals and Interactions over Processes and Tools: Agile methodologies prioritize the importance of people and their interactions in the development process over relying solely on tools or rigid processes.

2. Working Software over Comprehensive Documentation: Agile emphasizes the delivery of working software as the primary measure of progress, rather than extensive documentation.

3. Customer Collaboration over Contract Negotiation: Agile promotes close collaboration with customers and stakeholders throughout the development process to ensure that their needs are understood and met effectively.

4. Responding to Change over Following a Plan: Agile methodologies recognize the inevitability of change and prioritize the ability to adapt and respond quickly to new requirements or feedback.

5. Iterative and Incremental Development: Agile practices involve iterative cycles of development, where small increments of functionality are delivered regularly and refined based on feedback.

6. Cross-Functional Teams: Agile encourages the formation of cross-functional teams composed of members with diverse skills and expertise, promoting collaboration and shared ownership of the project's goals.

Traits of SAFe:

1. Scaled Agile Practices: SAFe provides a framework for implementing agile practices at scale across large enterprises, enabling coordination and alignment among multiple teams and stakeholders.

2. Hierarchical Structure: SAFe includes a hierarchical structure with different levels of planning and coordination, including the Portfolio, Program, and Team levels, to ensure alignment with organizational objectives.

3. Value Stream Alignment: SAFe emphasizes the alignment of development efforts with value streams, ensuring that teams focus on delivering value to customers and stakeholders.

4. Program Increments: SAFe organizes work into fixed-length timeboxes called Program Increments (PIs), typically lasting 8-12 weeks, providing a cadence for planning, execution, and delivery.

5. Scaled Agile Roles: SAFe defines specific roles and responsibilities at each level of the framework, including Release Train Engineers (RTEs), Product Owners, Scrum Masters, and various leadership roles, to facilitate coordination and collaboration.

6. Continuous Integration and Delivery: SAFe promotes continuous integration and delivery practices to ensure that working software is delivered frequently and reliably to customers.

In summary, while Agile focuses on principles such as flexibility, customer collaboration, and iterative development, SAFe extends these principles to address the complexities of large-scale enterprise environments, incorporating additional practices and structures to support coordinated delivery across multiple teams and value streams.