SUPERVISOR/CONTRACTOR: The supervisor/contractor may or may not be a lather/plasterer. They are ultimately responsible to organize crews, order materials and the quality control for the project. This person may be an estimator, project manager or contractor. They must know the code and standards related to lath and plaster. They should understand basic leadership skills, documentation of records and troubleshooting concerns. They are responsible for the installation of quality lath and plaster.