Abstract: A jig for a machine tool used in joinery, such as a portable router or the like, and which is suited for forming joints having compound angles, the jig suitably comprising: a work-piece mounting board means (11) having means (12) to releasably secure a work piece thereto; and a template board means (5) overlying the mounting board means (11) and against which the machine tool abuts, in use, and defining a template aperture (6) for guiding the machine tool in a pre-defined path relative to the work-piece to machine the work-piece, the template board means (5) and work piece mounting board means (11) being movable in more than one plane relative to each other to selectively position the work-piece at chosen angles of tilt relative to the work piece and releasably fastenable at the selected position, so that a compound angle joint may be machined by moving he machine tool around the template aperture and without need to re-adjust the position of the work-piece.