An S-curve equation for project control

This paper reports a development of an S-curve equation capable of producing an envelope of S-curves. The equation could be used in a variety of applications related to project control in the petro-chemical industry. The research consisted of developing the equation then carrying out various tests; the results show that the theoretical data correlate closely to actual data collected from various petro-chemical projects executed worldwide. The equation is being used in M. W. Kellogg to determine construction S-curves for various projects.