"devising methods" is a correct and usable phrase in written English.
It is typically used to refer to the act of coming up with or creating strategies or techniques to solve a problem or achieve a goal. Example: The team spent weeks devising methods to increase productivity and efficiency in the workplace.
Many obstetricians made their names by devising methods to get both mother and baby through an obstructed delivery.
Becoming an experimental discipline meant devising methods that allowed propositions to be tested that had previously been mere speculation.
Dr. Pickett himself was a pioneer in the field of devising methods of insect control that take full advantage of the predatory and parasitic species.
For more than a decade after the war, PTFE saw little commercial use, owing to difficulties encountered in devising methods for processing the slippery, high-melting material.
He made a large-scale plan of Beaune during a visit in 1762, devising methods of observation and constructing the necessary surveying instruments.
Education officials shed little light on why the fourth graders fared so much better this year, saying only that students were spending more time reading and writing, and that teachers were finally devising methods that worked.
The Bush administration has also promised to devise methods to cut off the smuggling of Iraqi oil.
Some doctors devised methods to treat shell shock victims — one German doctor tried electroshock to the limbs.
Fishermen worked with conservationists to devise methods to avoid hooking the exceptionally rare birds.
He later devised methods and equipment to photograph sea life at unprecedented depths.
The great technical problem is to devise methods of supporting and protecting these objects during the firing.
