The phrase "a key motive" is correct and usable in written English.
It can be used when discussing the primary reason or driving force behind an action or decision.
Example: "The investigation revealed that a key motive for the crime was financial gain."
Alternatives: "a primary reason" or "a main driving force."
The asymmetry in financial resources between the inventor (small) and the manufacturer (large) is a key motive for doing so.
The loss of the country's Muslim identity in the face of growing Christianity is also a key motive among Islamists.
That was a key motive for General Motors's joint venture with Toyota to make small cars in California.
ENI's management cited a desire to take advantage of the renewed impetus for energy liberalisation across Europe as a key motive for the bid.
Mr. Sullivan, Clorox's chief executive, called the combination of companies "a very good strategic fit" and added that international growth was a key motive.
To avoid this, expansion has often been timed to coincide with treaty changes: a key motive for the treaties of Maastricht, Amsterdam and Nice was the knowledge that the east Europeans were waiting in the wings.
Reducing pressure on secondary care services is the key motive for appointing a respiratory GPwSI, a top priority for the role, and the aspect of the service most likely to be monitored.
Along with all reasons reported by the participants, what they identified as the most important motive was registered separately in an attempt to assess the key motive that has lead to the decision in each individual case [ 22].
A key recognition motive is the hinge region that forms hydrogen bonds to the adenine moiety of ATP and is targeted by many kinase inhibitors.
Relief of boredom is a key smoking motive in the general population, and is positively correlated with both daily cigarette consumption and nicotine dependence [ 31].
When asked for their personal key motive in the consideration of a voluntary return, the contra-motive 'children born and raised in Germany' was reported most often (14.9%), followed by the contra-motive 'lack of medical and psychological care in country of origin' (8.5%) and the pro-motive 'Wish to die in home country' (8.5%).
