How to Frame a Partition Wall

Before driving in any nails, use a 4-foot level to check that the stud edges and faces are plumb (perfectly vertical). If adjustments are necessary, move the level and use a hammer to tap the partition into position. Then use the level to recheck for plumb.

If you find any spots where the top plate isn't snug against the ceiling, slip thin wood shims under the sole plate at the appropriate stud locations to close the gap at the top.