Process control is a statistics and engineering discipline that deals with architectures, mechanisms, and algorithms for controlling the output of a specific process. See also control theory.

For example, heating up the temperature in a room is a process that has the specific, desired outcome to reach and maintain a defined temperature (e.g. 20°C), kept constant over time. Here, the temperature is the controlled variable. At the same time, it is the input variable since it is measured by a thermometer and used to decide whether to heat or not to heat. The desired temperature (20°C) is the setpoint. The state of the heater (e.g. the setting of the valve allowing hot water to flow through it) is called the manipulated variable since it is subject to control actions.

Medicine is the art and science of healing. It encompasses a range of health care practices evolved to maintain and restore health by the prevention and treatment of illness.

Contemporary medicine applies health science, biomedical research, and medical technology to diagnose and treat injury and disease, typically through medication, surgery, or some other form of therapy. The word medicine is derived from the Latin ars medicina, meaning the art of healing.^[1][2]

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Imagine is John Lennon's second solo album and is considered the most popular of his solo works. Recorded and released in 1971, the album tended toward songs that were gentler, more commercial and less avant-garde than the ones he released on his more critically acclaimed previous album, John Lennon/Plastic Ono Band.^[1] The difference, he said, was that Imagine was "chocolate-coated for public consumption", in reference to the string sections prevalent throughout the album.