The conventional wisdom deriving from practice is that top management support is an unmitigated good for IS projects — so good, in fact, that the textbooks and research literature do not say what constitutes top management support, what function it serves, or how to obtain it.
Sauer, Christopher; Keil, Mark; and Qatsha, Alex, "Panel 14 Is What We Know About Top Management Support Practically Useful? A Challenge to the Conventional Wisdom" (1996). ICIS 1996 Proceedings. 72.