This paper makes the case for a spotting computation scheme which gives ris
e to a new classification methodology for processing real world data by sur
veying algorithms developed under the Real World Computing (RWC) program an
d related work in Japan. A spotting function has the segmentation-free char
acteristic which ignores gracefully most real world input data which do not
belong to a task domain. Some members of the family of spotting methods ha
ve been developed under the RWC program. This paper shows how some spotting
methods rise to the challenge of the case made for them. The common comput
ational structure amongst spotting methods suggests an architecture for spo
tting computation.