Reversible error has four, interdependent elements, each of which must be proven to net a favorable judgment on appeal. An appellant’s failure to prove any element forecloses relief.
The job of appellant’s counsel is to represent the appellant’s interests. Which means determining what arguable errors (issues) in a case are most likely to net the appellant a favorable judgment from the appellate court.
An appellate lawyer is a writer, a strategist, a researcher, a consultant. But in the end, an appellate lawyer’s skillset boils down to the art of proving or refuting reversible error.