When going through data sufficiency questions on the GMAT, it is important to be systematic about it. Consistency is the key to accuracy for GMAT data sufficiency. I have created this data sufficiency decision chart to help you navigate through data sufficiency questions in a systematic way. You can print it out and use it as a visual aid when you first start practicing with gmat data sufficiency questions. As you get more comfortable with GMAT data sufficiency, you can wean yourself off using the chart.