Ulrich et.al define competency as the ability to add value to the business; competence must focus on the process leading from changing business conditions to achieving sustainable competitive advantage. This HR model combines various aspects of competencies into five domains: strategic contribution, knowledge of the business, personal credibility, HR delivery and HR technology. They argue that competent HR professionals will have the personal credibility coupled with knowledge and behaviours to ensure that HR practices align with and accomplish business outcomes.