Institutional Repositories (IRs) are established mainly to provide access to information resources which are otherwise not easily accessible in digital format. Many institutions across the world and particularly in India have successfully developed their own IRs but have not attempted to assess their importance and impact on the Users. This study conveys the findings of the survey conducted at research centric CSIR (Council of Scientific and Industrial Research) laboratories of India to determine the scientists’ and research scholars’ preference for publishing their research materials; to measure the impact of IRs on their scholarly practices and to recommend future changes for inviting more participation in an IR. The study deduced that ‘Peer- Review scholarly Journals’ are preferred medium for publishing research content and ‘Increase in the access to grey literature’ is the most significant impact of IR on respondents. The findings of this research paper provide insight to the IR managers and administrators of low-deposit and low-usage repositories about the contributors’ apprehensions. The study will also help them to define and adopt policies that will eventually enhance their IRs visibility and impact.