CAPACITY ANALYSIS WITH SIMULTANEOUS PROCESSES Dr. Cynthia Knott’s dentistry practice has been cleaning customers’ teeth for decades. The process for a basic dental cleaning is relatively straightforward: (1) the customer checks in (2 minutes); (2) a lab techni-cian takes and develops X-rays (2 and 4 minutes, respectively); (3) the dentist processes and examines the X-rays (5 minutes) while the hygienist cleans the teeth (24 minutes); (4) the dentist meets with the patientto poke at a few teeth, explain the X-ray results, and tell the patient to floss more often (8 minutes); and(5) the customer pays and books her next appointment (6 minutes). A flowchart of the customer visit isshown below. Dr. Knott wants to determine the bottleneck time and throughput time of this process.

Practical Management Science
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Author:WINSTON, Wayne L.
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CAPACITY ANALYSIS WITH SIMULTANEOUS PROCESSES

Dr. Cynthia Knott’s dentistry practice has been cleaning customers’ teeth for decades. The process for a

basic dental cleaning is relatively straightforward: (1) the customer checks in (2 minutes); (2) a lab techni-
cian takes and develops X-rays (2 and 4 minutes, respectively); (3) the dentist processes and examines the

X-rays (5 minutes) while the hygienist cleans the teeth (24 minutes); (4) the dentist meets with the patient
to poke at a few teeth, explain the X-ray results, and tell the patient to floss more often (8 minutes); and
(5) the customer pays and books her next appointment (6 minutes). A flowchart of the customer visit is
shown below. Dr. Knott wants to determine the bottleneck time and throughput time of this process.

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