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Hello Usman, To create an Activity-Activity diagram in Act2, you will need to know what the predominant species in your system you wish to diagram and the species for the x and y axes. The predominant species is selected for diagramming under ‘diagram species’ and you would need to enter its activity. For example, to make a redox-pH diagram for iron, you would select Fe++ as the diagram species and then on the x and y axis, select the activity for O2(aq) and pH respectively. The diagram will then show you the predominant species of iron base on the pH and activity of O2(aq). I am not exactly sure what you mean by Fe2+ V activity of O2-, can you clarify on the predominant species you wish to diagram for in Act2? There are a couple of places with good resources to help you get started. Please refer to section 5 Using Act2 in the GWB Essentials Guide for more information regarding calculations and examples. The example I mentioned above is demonstrated in detail in the Stability diagrams lesson at the GWB Academy. Please attach your input file and thermo database file if you want someone to take a further look. Best regards, Jia Wang