Robot

Measures for use in operating a robot having one or more sensors. A representation of an environment of the robot is generated by operating the one or more sensors to sense a set of parameters representative of the environment of the robot. A list of objects in the environment and associated identifiers for each object in the list is generated. Control data is received from the electronic user device. The control data includes an identifier for an object in the generated list that a user of the electronic user device wishes to locate within the environment. In response to receipt of the control data, the robot and the one or more sensors are operated to search the environment to determine a location of the identified object in the environment.