This is a measure of an individual's ability to convincingly pass himself off as someone else, whether assuming a role in a play or attempting to infiltrate the fortress of his lord's enemy. It also represents a character's knowledge of the primary theater styles in Rokugan: Kabuki, a flamboyant high-action style; and Noh, a more subdued, stylistic manner of play.
The TN to disguise yourself is 15. This assumes that you are taking on the role of a non-specific individual who shares the same Clan affiliation, gender, and profession (bushi, courtier, or shugenja). Each of these basic features that are changed increases the total TN of the Skill Roll by +5 (for example, a male Scorpion bushi attempting to impersonate a female Crane courtier would have a base TN of 30). Attempting to imitate a specific individual is significantly more difficult, and increases the TN by a total of +15 in addition to any other increases of Clan, gender, or profession. You may also Raise on your roll to make your disguise harder to see through. A character who is trying to see through your disguise must roll Investigation / Perception against a TN of 15, +5 for each Raise you made.