Chapter 17, problem 7.

Suppose it is now the end of the seventh day and that activities A and B have been completed, while activity D is 50 percent completed. Time estimates for the completion of activity D are 5, 6, and 7. Activities C and H are ready to begin.

The partners have decided that shortening the project by two days would be beneficial, as long as it doesnt cost more than about $20,000. They have estimated the daily crashing costs for each activity in thousands, as shown in the part d table. Which activity should be crashed first?

TIME IN DAYS \begin{tabular}{ccccc} \cline { 3 - 5 } Activity & Immediate Predecessor & Optimistic & Most Likely & Pessimistic \\ \hline A & & 5 & 6 & 7 \\ B & & 8 & 8 & 11 \\ C & A & 6 & 8 & 11 \\ D & & 9 & 12 & 15 \\ E & C & 5 & 6 & 9 \\ F & D & 5 & 6 & 7 \\ G & F & 2 & 3 & 7 \\ H & B & 4 & 4 & 5 \\ I & H & 5 & 7 & 8 \\ End & E, G, I & & & \end{tabular}