Often they overlap or compete, and proponents of one tend criticize others.

But proponents of the law tend to remain quiet on the broader complaint that China's pretense of socialism has become more and more hollow.

Just as critics of "mental health parity" tend to describe the costs as prohibitive, so proponents tend to minimize or deny the differences between physical and mental illnesses.

The wood-bat proponents tend to contest that evidence with a more empirical view, contending that a specially engineered modern metal bat must deliver more force to a baseball than old-fashioned wood.

The proponents of these innovative ventures tend to cast their efforts as a twist on capitalism, what Mr. Kling of Minnesota Public Radio called "social purpose capitalism."

Most proponents of term limits have tended to favor a tenure of 12 years, that is, six terms for members of the House and two terms for senators.

The proponents of each of these approaches tend to dismiss the other as interesting but irrelevant.

The strongest proponents of such shifts tend to be those with the most to gain, in this latest case, investors and the professors they seek to sign on as talent.

The strongest proponents of the seven mass media taxonomy tend to be companies closely involved in mobile telephony.

The most vocal proponents of the theory have tended to be minority groups, such as farmers in an industrial society or nonwhites in a predominately white society.