A refusal creates a natural urge to answer every criticism or file again immediately. Either reaction can be wrong. The available remedy may have a short deadline, a fresh application may affect a pending review, and new evidence may solve one problem while leaving the legal error untouched.
The decision letter is the starting document. It should identify the reasons and usually state whether an appeal or administrative review is available. That statement must be checked against the law and the case’s procedural history where necessary.
The strategy should classify the problem before selecting the process: was the application deficient, did the decision-maker misunderstand the evidence, was the wrong rule applied, or was the procedure unlawful?