Introduction

Organizational environment where the organizational behavior takes place and the task roles employees need to perform have become increasingly complex in today's organizations. To respond to this complexity, modern organizations need willing, flexible, and proactive employees who go beyond narrow task requirements and who approach work proactively by showing personal initiative (Crant, 2000; Ohly, Sonnentag, & Pluntke, 2006; Parker, 2000; Sonnentag, 2003). In an era where the responsibility and decision making have shifted downward through transformational leadership and shared decision-making, employees have started taking part in both decision making and implementation process without constant close supervision (Frese & Fay, 2001; Sonnentag, 2003). They are expected to demonstrate discretionary behaviors that may go beyond their formally identified job descriptions to carry out the current expectations and comprehensive and complex tasks. Discretionary behavior refers to the employee behavior that is not directly or explicitly recognized by the formal reward system, and in the aggregate promotes the efficient and effective functioning of the organization (Organ, Podsakoff, & MacKenzie, 2006; Van Dyne, Cummings, & McLean Parks, 1995). Employee discretionary behaviors contribute to maintenance and enhancement of the social and psychological organizational context which supports task performance and organizational effectiveness (McBain, 2004; Organ, 1997). As Den Hartog and Belschak (2007) stated, employee discretionary behaviors are crucial for organizations to be able to stay competitive in today's global economy.