In their 1987 review of the field of organizational behaviour, House and Singh[1] put much emphasis on the importance of leadership and decision making in organizational study. Heller[2] and Janis[3] also emphasized an integration between two normally disparate topics in our attempts to understand micro-and macro-organizational issues.Other researchers have continued their attempts to explain better the nature of leadership and/or decision making as well as their relationships with other factors. Studies on the relationship between gender role and leadership style, or between decision style and leadership style have reflected this trend [4][5][6][7][8][9][10][11][12][13].Leader behaviour (i.e. leadership style) is often conceptualized as consisting of two independent dimensions: initiating structure and consideration [14,15]; task behaviour and relationship behaviour [16]; concern for production and concern for people [17]. According to Hersey and Blanchard[17], two dimensions of leader behaviour are defined as follows: task dimension includes goal setting, organizing, setting time lines, directing and controlling. By contrast, the relationship dimension includes giving support, communicating, facilitating interactions, active listening and providing feedback.In recent years, gender role (i.e. sex-role identity) has been studied by many researchers [6,[18][19][20]. According to Bem[18], the two dimensions of gender role are defined as follows. Masculinity includes being aggressive, independent, objective, logical, rational, analytical and decisive (i.e. the reverse of the femininity). By contrast, femininity includes being emotional, sensitive, expressive, cooperative, intuitive, warm and a tactful nature (i.e. the reverse of the masculinity).Many researchers have attempted to find the relationship between gender role and leadership style [5,10,[21][22][23]. They assumed that gender role is an important personality trait that influences leadership style. Thus, they have related masculinity with task-oriented leadership style and femininity with relationship-oriented leadership style. These relationships have been empirically supported.Decision style also has been studied by many researchers [24][25][26][27]. Four decision styles are defined by Rowe and Mason[26], with varying characteristics: