Hemo-tech, Inc., a biomedical technology and research laboratory, produces a standard blood filtering device on an assembly line basis. Six basic tasks are performed along an assembly line. The time to perform each task and the tasks that must immediately precede each task are in the table below. Twenty pumps per 450-minute day must be produced by the assembly line.

\begin{array} { | c | c | c | } \hline \text { Task } & \begin{array} { c } \text { Immediate } \\\text { Predecessors }\end{array} & \begin{array} { c } \text { Time to perform } \\\text { (min.) }\end{array} \\\hline \mathrm { A } & - - & 5.40 \\\hline \text { B } & \mathrm { A } & 3.20 \\\hline \text { C } & - - & 1.50 \\\hline \mathrm { D } & \mathrm { B } , \mathrm { C } & 2.80 \\\hline \mathrm { E } & \mathrm { D } & 17.10 \\\hline \text { F } & \mathrm { E } & 12.80 \\\hline\end{array}

a. Draw the network diagram of the precedence relationships.
b. Identify the absolute minimum and maximum cycle times.
c. How many workstations are required to meet the schedule?
d. What is the cycle time required to meet demand?
e. Balance this line using most following tasks heuristic.
f. What is the efficiency of the line obtained in part e?
g. Can the efficiency of this solution be improved? Explain.

Because Problems with Fixed-Position Layouts Are So Difficult to Solve

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