An operations manager wants to balance a line as efficiently as possible. The desired daily output rate is 60 units, and the line operates 9 hours a day. Given the precedence diagram, assign the tasks to workstations according to the following heuristics:

1. Most following tasks rule.

2. Ranked positional weight rule.

3. Compute the balance efficiency for both rules. Which assignment is better?

4 min 9 min 6 min 8 min 5 min A B 3 min 5 min 9 min 4 min