Data processing services are offered on a per-unit basis, where a unit is, for example, an application program running on a server. Environmental complexity, level of change, and type of environment are determined for each unit of the services and points are assigned. The points are summed to give a count of points for each unit, and the counts of points are summed to provide a total number of points. A baseline price for the services is divided by the total number of points to provide a per-point price. The price of any unit may then be determined by multiplying its count of points by the per-point price. When a new unit is added in, its count of points is determined. The baseline price is then adjusted by multiplying the count of points for the new unit by the per-point price, and adding the result to the previous baseline.