On what assumption the black box concept is based on
On what assumption the black box concept is based on The relationship between inputs and outputs is stable
outputs depend in an \aymptotically stable" manner on inputs, while internal signals remain bounded. When the output equals the complete state, one recovers the property of input to state stability (iss). When there are no inputs, one has a generalization of the classical concept of partial stability.
In science, computing, and engineering, a black box is a device, system or object which can be viewed in terms of its inputs and outputs (or transfer characteristics), without any knowledge of its internal workings. ... Almost anything might be referred to as a black box: a transistor, an algorithm, or the human brain.
Black-box testing is a method of software testing that examines the functionality of an application without peering into its internal structures or workings. This method of test can be applied virtually to every level of software testing: unit, integration, system and acceptance.
Marketing theory of consumer buying behavior in which what goes on within the human mind (the black box) is ignored, in favor of discovering which inputs (stimuli) produce the desired output (buying response).