Consortium (pl. Consortia): this word refers to a temporary business organisation created by businessmen or companies in order to carry out a certain task.
(Source: http://en.wikipedia.org/wiki/Category:Consortia)

Delayering: this word is a term in management and corporate restructuring that refers to a reduction in the number of layers of a management hierarchy.
(Source: http://en.wikipedia.org/wiki/Delayering)

Strategic alliance: a formal relationship formed between two or more parties to pursue a set of agreed upon goals or to meet a critical business need while remaining independent organisations.
(Source: http://en.wikipedia.org/wiki/Strategic_alliance)

Strategic fit (also know as strategic alignment): the extent to which the activities of a single organisation or of organisations working in partnership complement each other in such a way as to contribute to competitive advantage. The strategic fit of one organisation with another is often a factor in decision about acquisitions, diversifications or divestments.
(Source: http://dictionary.bnet.com/definition/strategic+fit.html)