Specify what your four primary situations will represent and record this information. As an example, you have $100 to spend on your date and four options: dinner, club, movie and the park. Assign one circle to each of your four evening options.
Determine the formula that you will use to evaluate these options and write it down. For instance, your evening plans allow you to use a simple formula adding the sums of each activity.
Write the specific information for each circle, using your formula to describe the event. As an example, if dinner costs $45 and a movie costs $15, you would record the price of dinner as "$45" inside the dinner circle and $15 in the movie circle.
Set your compass to one and a half inches and draw your first circle. Place the pencil of your compass in the center of your first circle, your pin next to that circle, and draw your second overlapping circle. Place your pencil in the center of the left circle, your pin below it, and draw your third overlapping circle. Repeat the process with your final circle. Increase the circle size if you need more space. Make sure that you see the specific regions where each circle connects and that there is enough room for you to write in each.
Fill in the values of each region by determining which circle is affecting each individual event and adding the values of those events together. For instance, in the section where dinner and movie connect, but no others, you would record $60.
Review your Venn Diagram to help you make your decision by evaluating the connection of your four events and comparing them by their single unifying trait. As an example, you have compared the four different evening events by a single trait, their cost. Review your work to determine if you have enough money to do all of the events during your evening, or use it to see which events you would like to do and how much money you will have left with your different options.