In manufacturing systems, a semi-continuous operation most commonly means the process runs continuously during each shift but stops between shifts for changeover, maintenance, or cleaning.

Introduction / Context:
Production systems are categorized as continuous, semi-continuous, or intermittent/batch. Understanding these modes helps planners choose staffing patterns, maintenance windows, and inventory strategies that match demand and equipment constraints.

Given Data / Assumptions:

• “Semi-continuous” is contrasted with fully continuous operations (24/7 with only brief planned stops).
• It typically implies long, steady runs, but with regular off-periods.
• Stopping points often align with shift boundaries or sanitation requirements.

Concept / Approach:
In semi-continuous modes, a line runs without frequent starts/stops during a shift to minimize transients and quality variation, then pauses between shifts for scheduled activities. This is common in food, chemicals, and packaging where cleaning or changeovers are required but long steady runs are desirable.

Step-by-Step Solution:
1) Identify defining feature: long, uninterrupted runs per shift.2) Recognize scheduled pauses: between shifts for maintenance, cleaning, or product changeovers.3) Match to the option that explicitly describes continuous-per-shift but not 24/7 operation.4) Choose option A.

Verification / Alternative check:
Operations management texts position semi-continuous between continuous flow and intermittent batch, often characterized by predictable off-times.

Why Other Options Are Wrong:
B: Operator breaks do not define process category. C: Computerization is orthogonal to continuity. D: Describes variety in routing, not continuity. E: Weekly batch is intermittent, not semi-continuous.

Common Pitfalls:
Equating “semi-continuous” with random starts/stops; the hallmark is sustained runs within a shift schedule.

Final Answer:
The operation is continuous each shift, but stops between shifts.