Your objectives define your booth space
Evaluate your booth space as it relates to your objectives.
Most exhibitors are in the space they are using by default. They may have begun in a 10x10 foot space and over time grown into an undefined larger space without doing a "zero-based" analysis of their objectives as they relate to the space needed to achieve their objectives.
For example, let's say that you have set an objective to generate 75 qualified leads. On average, experience tells us you'll need to talk to ten visitors to find one qualified lead, which means that you'll need to engage and talk to 750 visitors to find 75 qualified leads. In addition, the size of your space should also include being able to accommodate enough staff members to accomplish the lead generation goal as well as to have enough space to display and/or demonstrate your products and afford ample visitor traffic flow.