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The principle that emphasizes stakeholder involvement is the collaborative approach. This principle highlights the importance of involving all relevant stakeholders throughout the project lifecycle to ensure that their interests and needs are understood and addressed. Engaging stakeholders fosters a sense of ownership and helps to create a shared understanding of the project goals, enhancing communication and encouraging collaboration.

The collaborative approach not only enhances the quality of the deliverables by incorporating diverse perspectives but also promotes alignment between stakeholder expectations and project outcomes. This engagement is vital in Agile environments, where flexibility and responsiveness to change are prioritized.

In contrast, while adequate planning, iterative development, and frequent delivery are important aspects of Agile methodologies, they do not specifically focus on stakeholder involvement. Adequate planning is about ensuring that sufficient and effective planning is undertaken to guide project progress. Iterative development refers to the development process itself, where work is completed in cycles, allowing for adjustments based on feedback. Frequent delivery emphasizes delivering product increments regularly to provide value to stakeholders, but it does not inherently guarantee their involvement.