Relativity - The Twin Paradox. (R4 Version 1.0.0) - The "Twin Paradox" is a thought experiment in Special Relativity, that has attracted a considerable amount of discussion and analysis since Einstein first demonstrated the existence of time dilatation in the Special Theory. It is essentially a "paradox" concerning the comparison of the ages of twins, after one of them has made a high speed journey over a long period of time, while the other has remained stationary. Because each sees the other as in motion throughout the journey, the paradox maintains that each should see the other as having aged more slowly than himself. Opinions are divided as to whether this is a paradox at all, and efforts to date have not satisfactorily resolved the issue. It is believed that this is because such efforts have not fully considered the temporal aspects of the problem, only the spatial. This short paper now analyses the problem using the Relativistic Domain mathematical formulation of the Special Theory, thereby giving equal prominence to its temporal and spatial aspects. This provides a simple resolution, which demonstrates that the problem is not paradoxical at all, as each twin is able to correctly identify the age difference resulting from the time dilatation effects of the journey.