An airspace complexity reducing system is provided. The airspace complexity reducing system has a data storage device including data describing a multivariable model of an airspace complexity, the airspace complexity being a cumulative effect of factors that influence a system user's ability to manage aircraft in an associated airspace. The airspace complexity reducing system also has a selecting module configured to select a variable from a plurality of variables of the multivariable model and determine an amount by which to modify the selected variable to achieve a predetermined airspace complexity value. In addition, the airspace complexity reducing system has a suggestion module configured to determine a modification to the airspace that results in the determined variable modification and transmit the determined course of action to the system user.