The Agile Manifesto defines four core values that shape Agile development methodologies. However, there are also twelve guiding principles that provide more specific guidelines for Agile methods. 

These twelve principles emphasize the importance of customer satisfaction through early and continuous software delivery, accommodating changing requirements throughout the development process, frequent delivery of working software, a collaboration between business stakeholders and developers, supporting, trusting, and motivating the people involved, enabling face-to-face interactions, using working software as the primary measure of progress, implementing Agile processes to support a consistent development pace, paying attention to technical detail and design, emphasizing simplicity, promoting self-organizing teams, and regularly reflecting on how to become more effective.

The Twelve Principles of Agile development include:

1) Customer satisfaction through early and continuous software delivery – Customers are happier when they receive working software at regular intervals, rather than waiting extended periods of time between releases.

2) Accommodate changing requirements throughout the development process– The ability to avoid delays when a requirement or feature request changes.

3) Frequent delivery of working software– Scrum accommodates this principle since the team operates in software sprints or iterations that ensure regular delivery of working software.

4) Collaboration between the business stakeholders and developers throughout the project– Better decisions are made when the business and technical team are aligned.

5) Support, trust, and motivate the people involved– Motivated teams are more likely to deliver their best work than unhappy teams.

6) Enable face-to-face interactions – Communication is more successful when development teams are co-located.

7) Working software is the primary measure of progress– Delivering functional software to the customer is the ultimate factor that measures progress.

8) Agile processes to support a consistent development pace– Teams establish a repeatable and maintainable speed at which they can deliver working software, and they repeat it with each release.

9) Attention to technical detail and design enhances agility– The right skills and good design ensure the team can maintain the pace, constantly improve the product, and sustain change.

10) Simplicity–the art of maximizing the amount of work not done–is essential” Develop just enough to get the job done for right now.

11) Self-organizing teams encourage great architectures, requirements, and designs – Skilled and motivated team members who have decision-making power, take ownership, communicate regularly with other team members, and share ideas that deliver quality products.

12) Regular reflections on how to become more effective – Self-improvement, process improvement, advancing skills, and techniques help team members work more efficiently.

By following these principles, Agile methodologies aim to align development with business needs and enable teams to deliver value faster while adapting to changes. With a focus on customer satisfaction and collaboration, Agile has become a widely adopted approach to software development and continues to evolve as a methodology that emphasizes continuous improvement and efficiency.