Abstract: A toy vehicle slot track is disclosed with at least a pair of toy racing vehicles and at least a pair of guide slots, each guide slot in turn having a pair of exposed power supply rails. The toy vehicles are guided about the track by guide pins affixed to the toy vehicles, the guide pins running within the guide slots. In a first portion of the track, the guide slots are spaced apart at a distance greater than the maximum width of the toy vehicles. In a second portion of the track, the guide slots are spaced apart at a distance less than the maximum width of the toy vehicles. The power supply rails run parallel to and at a uniform spacing from the guide slots in both portions of the track, providing power in both track portions to electric motors contained in the toy vehicles.

Abstract: A software engineering tool is disclosed which enables the efficiency and performance of a program design to be evaluated prior to the time the program is written into code. Every possible path that can be followed in the implementation of the program is identified, and its length is measured. From this information, reports are generated which point out the longest paths in the program and sources of potential performance problems. In addition, weights which identify relative complexities or performance timings can be assigned to individual modules in the program, and form the basis of other reports which indicate timing performance. The user is provided with the opportunity to alter the weights assigned to modules, and thereby determine the effect which different weights have on the overall performance of the program.