37. The non-transitory installation medium of claim 33 , wherein the environmental parameter specifies temperature.
33. A non-transitory installation medium storing instructions executable in an electronic device that provides a plurality of environmental parameters within a block diagram model for modeling a system, the non-transitory installation medium storing: one or more instructions for defining blocks within the block diagram model; one or more instructions for providing a plurality of partitioning blocks for use within the block diagram model to define a first region and a second region of the block diagram model; one or more instructions for locating the partitioned regions of the block diagram model partitioned by the plurality of partitioning blocks; one or more instructions for determining a destination to which an environmental parameter is passed, the environmental parameter being an attribute of a physical environment where the blocks of the block diagram model operate; one or more instructions for passing a first of the plurality of environmental parameters to a first of the partitioned regions of the block diagram model without passing the first of the plurality of environmental parameters to other partitioned regions of the block diagram model; and one or more instructions for passing a second of the plurality of environmental parameters to a second of the partitioned regions of the block diagram model without passing the second of the plurality of environmental parameters to other partitioned regions of the block diagram model.