"Duplicative efforts" refers to the unnecessary repetition or redundancy in doing the same task or work multiple times. It means doing something again and again when it is not needed or when it can be done just once. Full definition
What if you raise prices, invest in staff training and reduce duplicative efforts? (entrepreneur.com)
Similar and complimentary programs are now aligned and working together, reducing costs, red tape and duplicative efforts while increasing the effectiveness of the state's housing and community renewal programs. (nyshcr.org)
Through a coordinated system, a community school offers more effective programs and services than any one of its partners could offer on its own and eliminates duplicative efforts. (cacommunityschools.org)