Onesearch is a "discovery layer" that allows you to search the content owned and accessible to the University Libraries, including  journals, books/ ebooks, media and more. It searches through many of our library article databases and ebook pacakges at once. It is best for articles and books/ebooks. I would not use it to search for market research reports. Some individual titles (such as the Harvard Business Review) can not be accessed via Onesearch.