Don't cut all the way through the slab. Mesh reinforcing does not eliminate cracking. Frequent small, random cracks will still develop. However, the mesh helps hold these cracks together and the individual segments in position. Where greater control over cracking is required, use carefully placed reinforcing bars.
Proper design is essential.
Use extra care when using reinforcing mesh to locate it uniformly at the center of the slab. Mesh in flat sheets, rather than roll form, is easier to position properly and is recommended. Once in place, do not walk on the mesh to avoid pushing it out of position. Do not pull or push the mesh into position through the concrete. Use commercial reinforcing chairs or supports to assure proper positioning.