The aim of this review is to focus on aspects of superplasticity which are relevant to understanding the structure-property correlations and micro mechanisms related to specific material parameters used as superplastic material potential indicator. Since the main point of micro structural mechanisms and deformation conditions that control superplastic forming, among different test conditions, are related to tensile/creep test results and micro structural analysis. The parameters that are prerequisites for materials to exhibit superplasticity are reviewed, from deformation such as strain rate sensitivity index (m), temperature (T) and micro structural conditions related to grain (size, shape, stability), nature of grain boundary followed by mechanical and microstructural characteristics with several aspect of tensile behaviour under deformation conditions as nature of stress-strain rate curves, effect of strain rate sensitivity on ductility and parameters of the constitutive relationship and finely considering the mechanisms for superplastic deformation. The field of superplasticity has expanded dramatically including mechanically alloyed metals, super alloys, ceramics, intermetallics, and metal matrix and ceramic matrix composites. All have some specific material parameters closely related to micro structural mechanisms used as superplastic potential indicator. The main reason for reviewing the superplastic flow behaviour and micro structural evolution during deformation is the necessary knowledge of this process and related micro structural mechanism, whose superplastic forming parameters of control process are related to the test performed and micro structural analysis of results.