The phrases "системная задача" и "системная проблема" are often used by Russian economists, business people, etc. to describe a task or problem that is multifaceted, involving and/or affecting many different factors, and should be solved as a whole, while paying attention to each of the involved factors. Or, in other words, all factors and elements involved should be regarded as a system. The definition of "system" here is pretty much the same as in "system analysis."

What would be the closest English equivalent? Holistic seems to be fairly close, but for me, the word has a very strong New-Agey connotation. Not to mention that "holistic task" is not very clear. System task definitely won't work, since in English it means a system-level task runing on your computer.
Maybe "tasks/problems that require systems thinking to solve"?