In handwriting examination, the more samples you have, the better the comparison results will be. At least seven standard (authentic) documents are recommended so the examiner can observe natural variations in a person’s handwriting, however it is recommended to get more. Having multiple samples helps ensure that any differences seen are due to genuine writing habits, not just changes in mood, speed, or environment. 

The text being compared should be as similar as possible in content to the questioned document. For example, if the questioned document is a signature on a check, then the standard should also be a signature from a check, not from a letter. This ensures that the writer’s habits are observed under similar conditions, as people may write differently depending on the type of document. 

Handwriting can change over time due to age, illness, injury, or practice. To ensure accuracy, the collected standards should be from a time period close to the creation of the questioned document—ideally within five years before or after. This helps match the writer’s style from the relevant time frame, reducing the risk of comparing outdated or overly recent writing styles. 

The type of pen, pencil, or other writing instrument, as well as the paper type, can affect handwriting characteristics. For instance, ballpoint pens produce different strokes than fountain pens, and rough paper can change writing pressure compared to smooth paper. Using the same materials ensures that any differences are due to the writer’s habits, not to the tools or surfaces used.