"duplicative work" is correct and usable in written English.
It is often used to describe work that is unnecessary because it has already been done. For example: We need to find a way to reduce the amount of duplicative work that is done in our department.
Using a single source helps us to avoid duplicative work as well as inconsistencies between sites and services.
Balthazar's waiters — like waiters at most restaurants — spend a lot of time doing the seemingly duplicative work of punching orders they have already written down onto touch-screen computers.
The more cooks in the kitchen, the more likelihood that inefficiencies will result as professionals engage in duplicative work and, more benignly, a greater number of professionals spend time getting "up to speed".
We wanted to eliminate as much duplicative work across the platform and give them a flexible query interface.
The new partnership will further stimulate development by taking advantage of thus-far-neglected synergistic effects and by avoiding duplicative work, the ministers believe.
"At the same time, our user base expressed an interest is leveraging Pinterest for selling, and shared with us that there was a lot of duplicative work between selling via Etsy, Ebay and posting in Pinterest," Guerrero explained.
Their mission, NASA declared, was to "reduce shuttle costs by cutting out duplicative or unnecessary work while still performing all the work required for safe and reliable flights".
But Smith has also said he wants to ensure approved projects are "not duplicative" of other work the NSF is funding -- even though scientific research is, by its nature, meant to be replicated.
Amongst other more subtly ridiculous things, Rep. Smith's bill would require that projects not be "duplicative" of other federally funded work.
It says its board already analyzes incentive pay for executives, so the additional work being suggested would be duplicative.
Various models of genomic duplications, e.g. the duplicative transposition or the endoduplication, have been documented.
