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по мере необходимости stresses
gen.	as deemed necessary (tlumach); as appropriate (Iv_lar); whenever required (Johnny Bravo); from time to time (YuliaO); at pace (Andrey250780); so far as necessary (Stas-Soleil); as it may apply (Technical); as may be requisite (elmajor); as the need required (Andrey Truhachev); on an ad hoc basis (We meet on an ad hoc basis Taras); as and when necessitated (Alexander Demidov); as may be required from time to time (AD Alexander Demidov); as the need arises (ABelonogov); as often as required (drag); as and when necessary (mascot); when necessary (Andrey Truhachev); when needed (Andrey Truhachev); on an occasional basis (Rori); as needed (Alex_Odeychuk)
Gruzovik	as the necessity arises
comp., MS	on an as-needed basis (bookworm)
context.	as they are needed (Рихтер Дж. CLR via C#. Программирование на платформе Microsoft .NET Framework 4.5 на языке C#, 2013 Alex_Odeychuk)
IT	as they see fit (Рихтер Дж. CLR via C#. Программирование на платформе Microsoft .NET Framework 4.5 на языке C#, 2013 Alex_Odeychuk)
lat.	ad hoc (not regular or planned, but happening only when necessary – We meet on an ad hoc basis. Kosarar)
law	as frequently as circumstances dictate (triumfov); as and when needed (Leonid Dzhepko); when the need arises (Leonid Dzhepko)
Makarov.	as required
math.	as may be necessary
med.	as the circumstances require (Andrey Truhachev)
nautic.	occasionally
O&G, sakh.	as necessary; as needed
offic.	as and when required (Alexander Matytsin)
pharm.	as the circumstance arises (wikipedia.org Andrey Truhachev); in the circumstances (wikipedia.org Andrey Truhachev); pro re nata (об использовании препарата Dimpassy)
progr.	at the moment of need (напр., ресурсы выделяются процессу ssn); on demand (ssn)
R&D.	as applicable (igisheva)
tech.	condition-based (Val_Ships)
по мере в случае необходимости
gen.	when as, if the need arises

по мере необходимости: 31 phrases in 13 subjects

Automated equipment	2
Business	1
General	7
Mass media	3
Medical	1
Nautical	4
Officialese	2
Oil / petroleum	1
Polygraphy	2
Programming	3
Quality control and standards	1
Technology	3
Trade unions	1