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5.3 Determining the significant issuesWhen the results from the preceding phases (LCI, LCIA) have been found to meet the demands of the goal and scope of the study, the significance of these results shall then be determined. The results from both the LCI phase and/or LCIA phase are used for this purpose. This should be done as an iterative process with the evaluation element.Significant issues can be: inventory data categories, such as energy , emissions, waste, etc.; impact categories, such as resource use, Global Warming Potential, etc.; essential contributions from life cycle stages to LCI or LCIA results, such as individual unit processes or groups of processes like transportation and energy production.Determining significant issues of a product system can be simple or complex. This International Standard does not provide guidance on why an issue may or may not be relevant in a study, or why an issue may or may not be significant for a product system.A variety of specific approaches, methods and tools are available to identify environmental issues and to determine their significance.6 Evaluation6.1 Objectives and requirementsNOTE See clause A.3 in annex A for examples.The objectives of the evaluation element are to establish and enhance the confidence in and the reliability of the results of the LCA or the LCI study, including the significant issues identified in the first element of the interpretation. The results should be presented in a manner which gives the commissioner or any other interested party a clear and understandable view of the outcome of the study.The evaluation shall be undertaken in accordance with the goal and scope of the study, and should take into account the final intended use of the study results.During the evaluation, the use of the following three techniques shall be considered:a) completeness check (see 6.2);b) sensitivity check (see 6.3);c) consistency check (see 6.4).The results of uncertainty analysis and assessment of data quality should supplement these checks.6.2 Completeness check6.2.1 ObjectiveThe objective of the completeness check is to ensure that all relevant information and data needed for the interpretation are available and complete
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