Nowadays, there are many uncertainties and risks prevailed in environment especially for information technology (IT) projects in Pakistan context. Behavioural aspects of project management play important role to attain success. Soft dimension of project implementation profile consists of critical success factors like top management support and client acceptance. The proposed study of this paper designs a questionnaire and examines the relationship between behavioural factors and project success. There were 223 respondents from the population of Pakistan software board directory. The results indicate that client acceptance had a positive and significant relationship with project success. Moderation was performed categorical of leadership style; transactional and transformational leadership style.