The SEA process is iterative and should be applied to each stage of a Local Plan’s progression. It is designed such that issues identified early in the process can be teased out and addressed as the plan takes shape. The process completes with an independent Examination in Public where the plan is tested against compliance with legislative requirements. This legal check includes evidence that the Sustainability Appraisal has been properly followed; evidence of its effects should be apparent. At the same time tests of soundness which explore whether the plan is justified, effective and compliant with national policy, are conducted.