'The report(v2) proposes a new graphical input specification language g-Promela for SPIN model checker. Basic features of g-Promela language are defined using the formal syntax of graphical elements and semantics as an extension of labeled transition systems. The various kinds of labels of transitions are specified with valid Promela statements. To build g-Promela models, we have sketched the design of the Graphical Promela Interface(GPI) toolset, which is built upon the existing UPPAAL GUI. The graphical models are then translated to textual Promela to verify temporal properties using SPIN engine at the background. The translation is automated by building a parser which is part of the adapter tool built between the user interface GPI and SPIN engine. Verification is done manually using SPIN on the example models translated to textual Promela model from the g-Promela models built.'