Self-reports of aggression are deeply impacted by response bias, especially by social desirability, but there are no specific methods for controlling this bias. Furthermore, despite the importance of the subject few instruments have been designed to assess both direct and indirect forms of aggression. The aim of the present research was to develop a brief measure that comprises both forms of aggression and which makes it possible to obtain scores free of social desirability and acquiescence effects. The scales were created using recently developed methods for controlling response bias effects in a sample of 750 participants over a wide age range. The items were chosen by a panel of judges from among the best of the existing aggression measures. Confirmatory factor analysis showed the expected three factor structure (CFI = .98; AGFI = .97 and RSMEA = .078, 90% C.I. = .074 – .083) and the scales showed good psychometric properties in that they had good reliability (ranging from θxx = .77 to θxx = .83), and convergent and criterion validity.
