The phrase "a decline in effectiveness" is correct and usable in written English.
It can be used when discussing a reduction in the ability or efficiency of something, such as a process, strategy, or product.
Example: "The recent changes in management have led to a decline in effectiveness in our team's performance."
Alternatives: "a decrease in efficiency" or "a drop in performance".
Although Goldberg described an emergence of a new side-effect [ 9] we are describing a decline in clinical effectiveness.
So, a failure to elicit the right kind of information (the preferences of couples) contributed to a decline in the effectiveness of the match, by giving couples incentives to circumvent the clearinghouse.
AS THE advertising industry recovers from the deep slump that began in 2001, it is struggling to cope with a decline in the effectiveness of some of its traditional ways of getting a message across, such as 30-second ads on network television.
That will be a mark of success rather than failure, although we will see it reflected in a decline in the effectiveness advantage that women in office now have.
His lack of sympathy for the nationalism of the local Estonian government and his quarrels with his British advisers, however, brought about a decline in his political effectiveness.
As the developmental model of state would predict, this contradictory co-existence of neoliberalism and populism led to a decline in state policy effectiveness.
Throughout the weeklong gathering Mr. Hooks lead an assault on the Administration and attempted to temper criticism that the association has outlived its usefulness and has suffered a decline in prominence and effectiveness.
The development and spread of AMR results in a decline in the therapeutic effectiveness of antimicrobials and consequently a significant increase in patient morbidity and mortality [ 1].
But critics say the move underscores a decline in the prominence and effectiveness of the nation's oldest and largest civil rights group.
But many in shamanic traditions have, in their friction, failed to mold the shamanic experience to fit the modern world, perhaps leading, Jez suggests, to a decline in its appeal or effectiveness.
