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The Agile development model that employs small teams with defined roles, specifically including the Scrum Master and Product Owner, is Scrum. In Scrum, the team is typically composed of cross-functional members who collaborate closely to deliver increments of work.

The Scrum Master acts as a facilitator for the team, helping to manage the process and ensuring that Scrum practices are followed. They remove obstacles that may impede the team's progress and facilitate communication within the team and with stakeholders. The Product Owner, on the other hand, is responsible for defining the vision of the product, managing the product backlog, and prioritizing requirements based on business value and stakeholder needs.

This structure encourages communication, accountability, and continuous improvement, which are key principles of the Agile methodology. By utilizing these roles, Scrum teams are able to respond quickly to changes and deliver value effectively and efficiently.

Other Agile development approaches, such as Kanban, also promote iterative progress and efficiency but do not have the defined roles of Scrum Master and Product Owner. Waterfall is a traditional sequential development model, and Spiral is a risk-driven model; neither incorporates the specific team structure and roles found in Scrum.