Tier 3 assessment

Definition

A Tier 3 assessment is the entry-level methodological approach defined by the ITU-T L.1480 standard, designed specifically for rapid screening and initial estimation of the environmental impacts of digital solutions.

Key Characteristics

• Utilizes secondary, generic data and proxies to estimate environmental outcomes.
• Intended for first-approximation purposes rather than granular impact measurement.
• Lacks detailed analysis of contextual nuances and higher-order environmental effects.
• Not considered a rigorous analytical method within the ITU-T L.1480 framework.

Applications

• Preliminary screening of digital projects.
• Early-stage internal decision support where data availability is limited.
• Identification of potential scope for more rigorous future assessments.
• Note: This method is explicitly excluded from use in public or consumer-facing communications due to its limited precision.

Related Concepts

• Tier 1 assessment
• Tier 2 assessment
• ITU-T L.1480
• Second-order effect
• Higher-order effects

Related Entities

None.

Mentions in Source

• “c) Tier 3 assessments: Tier 3 assessments shall consider net second order effects and should identify contextual factors and higher order effects. These are the simplest assessments and are not considered rigorous.” — ITU-T L.1480 (Greening by Digital)
• “Tier 3 assessments shall not be used for public or consumer communication.” — ITU-T L.1480 (Greening by Digital)