any operational measure or action taken through time in order to improve the current provision of ATM operations.
SESAR Working Method on Services (D100, Ed. 00.05.00, 2014)
'Operational improvements' are not necessarily related exclusively to the effect of a change in technology, they can relate to procedures, working methods or routines and human factor aspects. An 'operational improvement' is always associated to an operational benefit. An 'operational improvement' is associated to one or more 'strategic objectives' and is part of one or more 'directions of change.' An 'operational improvement' could also mean the 'improvement of an existing capability' and/or the introduction of a new capability. (notes source: ICAO ATMCP-WG/WHL/2-WP/32, p.3)
Lexicon Release 2015.1