The author of a text is not identified by a single word or isolated error. The expert analyses a pattern of features: vocabulary, syntax, composition, recurring expressions, punctuation characteristics, linguistic habits and genre-specific manner of writing.
Comparable samples from the presumed author are particularly important.
What you can do
- collect the disputed text and its context;
- select comparable samples from the presumed author;
- formulate appropriate questions for the expert;
- prepare a specialist opinion or an expert report review.