AI evaluation has become a critical factor in AI implementation success, particularly for generative AI systems. The stakes are high, with over 80% of AI projects failing. To properly evaluate AI systems, organizations must adopt a multidimensional approach that examines output quality, creativity, ethical considerations, and alignment with human values. Traditional metrics like accuracy, precision, and recall are insufficient for generative AI, which requires practical alternatives to assess content quality. Modern evaluation combines computation-based metrics with model-based metrics, such as consensus methods and reference-augmented evaluation. Effective AI evaluation balances diverse priorities across the organization, including methodical stakeholder interviews, mapping requirements, quantifying stakeholder priorities, and using tools like the Analytic Hierarchy Process. A unified evaluation platform, like Galileo, streamlines this process by providing customizable dashboards, multi-level reporting features, and a robust set of AI evaluation metrics. The platform enables comprehensive requirement documentation, automated evaluation triggers, and detailed feedback on guardrail implementation. Continuous evaluation throughout the AI lifecycle maintains model quality and reliability, with tools like A/B testing, automated retraining pipelines, and comprehensive monitoring capabilities. By addressing system complexity, standardized metrics, and ethical considerations, organizations can deploy reliable, high-performing AI solutions using a structured approach.