What the correct principle, or principles, of instrumental transmission are is controversial.  Most commonly, principles describe transmission to necessary means.  However, some speak of sufficient means, and others speak of neither.  For example, Raz’s Facilitative Principle speaks of “facilitating plans.” Some transmission principles say that “oughts” transmit from end to means, others say that the full force of the reason for the end transmits to the means, others say that the strength of the reason for the end that transmits to the means is proportional to other factors, and others, like Raz’s Facilitative Principle, say only that some reason for the end transmits to the means.