1. Goldratt: Balance flow not capacity
Process Flow Analysis
Goldratt: Balance flow not capacity
8/24/04
Paul A. Jensen
Operations Research Models and Methods
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2. Our Goal: For a single product
Given: the process design
Given: operation time and scrap rates at each operation
Given: product demand
Find: The flow in each operation and the total time required for each operation

3. To construct a model you must know the process
The process is described by its operations

4. The process model admits greater detail

5. What happens to product flows at junctions?
Do they assemble?
Do they combine?
Do they mix?
Do they disassemble?
Do they separate?
Do they split?

6. “And” nodes model flows that assemble
The flows are equal on all entering and leaving arcs

7. “Or” nodes model flows that combine
The total flow in equals the total flow out

8. “Proportionality” nodes model arbitrary combinations
Input and output proportions are given

9. All junction nodes must be specified in a process chart