The phrase "assist greatly" is correct and usable in written English.
It can be used when describing the extent to which someone or something helps or supports another person or entity.
Example: "The new software will assist greatly in streamlining our workflow and improving productivity."
Alternatives: "help significantly" or "aid considerably".
High-fibre foods have a beneficial role in appetite control, and hence eating a high-fibre diet can assist greatly in weight control and weight-loss, but only with self-monitoring and a bathroom scale.
He said the power will "assist greatly" the rebalancing of the Northern Ireland economy.
Theoretical models, especially computer-based theoretical models, have a potential to assist greatly in fire safety decision-making.
This will assist greatly in predicting risk for other critical injuries related to vital neighbouring structures such as vasculature, brain stem, cranial nerves and spinal cord.
In particular, highly permeable layers at the completion or in between the completion and the oil water interface assist greatly in reducing coning.
Molecular assays also can be used to subtype influenza isolates, and sequence analysis of hemagglutinin may assist greatly in surveillance studies and vaccine strain selection.
A major campaign to control noxious emissions was launched, assisted greatly by a changeover from coal to natural gas as the principal fuel.
And his numerous letters to the leading men of the country assisted greatly to form a sentiment favourable to a more perfect union.
These facilities assisted greatly in keeping the fleet fully operational.
"[It] has assisted greatly in reducing the availability and accessibility of many harmful substances to persons who were not aware of the associated dangers," a representative stated.
Furthermore, de Gayangos assisted greatly by locating important documents in the British Museum and in the collection of the bibliomaniac Thomas Phillipps, who owned around 60,000 manuscripts.
