Abstract: A method of operating an industrial plant having processing units on a production floor which includes a wireless network including a network server having stored a two-dimensional (2D) plantwide model and a 3D plantwide model showing the processing units. At least a first worker is on the production floor. The first worker is provided a first handheld computing device having a wireless transceiver, a processor programmed to implement a model rendering algorithm stored in an associated memory, and a display. Based on a task defined for the first worker to execute involving at least a first processing unit of the processing units, a model portion of the 2D plantwide model or 3D plantwide model involved in the task including the first processing unit is identified. An image representation of the model portion is then rendered on the display.