786 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS INVENTORS Figure 2. Initial PERT network-sources of ideas to concept Figure 3. PERT network-from concept through product stage especially important since any delay aIong it wiII affect the completion of other activities. Any effort to speed up a proiect should be directed to those activities comprising the critical path. The total network is upgraded when an activity is completed and an esti- mated time is changed to an ,actual time. This upgrading produces a consider- able amount of calculations which lend themselves to computer processing. The specific events (Fig. 5) are given identification numbers which simplify analysis of the network. Using the events and activities shown in Fig. 5, time

COMPUTER-ASSISTED PRODUCT DEVELOPMENT 787 Figure 4. PERT network-final stages-product through production Figure 5. PERT network R & D functions-critical path analysis for nail lacquers estimates for completion of the network have been established using the criti- cal path method. In the following sections of the paper, specific applications of computer techniques to product formulations, analysis, and color formulations are dis- cussed.

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