The four core principles of Agile methodology, derived from the Agile Manifesto, are:
Individuals and interactions over processes and tools: Valuing human communication and feedback more highly than rigid adherence to tools and processes.
Working software over comprehensive documentation: Prioritizing functional software as the primary measure of progress.
Customer collaboration over contract negotiation: Engaging with customers in a continual development cycle based on their feedback.
Responding to change over following a plan: Embracing adaptive planning, evolutionary development, and flexibility in response to changes.