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Many organizations attempt to implement Green ICT. Some adopt a deliberate and holistic policy, but most approach it piecemeal. The formal definition and approach to implementing Green ICT remains elusive, because most organizations are unable to properly identify what areas to address. A comprehensive and practical Green ICT framework helps overcome this problem. Measurement is important because it enables benchmarking and comparisons by quantifying the degree of implementation of Green ICT. User organizations can then be compared to each other, or to themselves over time, to determine the extent and effectiveness of their Green ICT strategies. This paper outlines a research-based yet highly practical Green Computing framework. It is based on a 4 x 5 matrix with four vertical "pillars": Lifecycle, End User IT, Enterprise and Data Center IT, and IT as a Low-Carbon Enabler. Applied against each pillar is a five-level Capability Maturity Model metric which can be based on a detailed survey of the organization's policies and practices in each area. The five horizontal dimensions, or "actions" are applied across the four pillars: Attitude, Policies, Practices, Technologies and Metrics.