11-CS-4 Engineering Law and Professional Liability · December 2013
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
Sequential design—often called the "over-the-wall" approach—organizes product development as a series of discrete, hand-off stages: marketing defines requirements, design engineering produces a design, and only then does manufacturing engineering work out how to make it, with each function completing its work before passing the project to the next. Its weakness is that problems of manufacturability, cost, or quality are discovered late, when changes are expensive and schedules already committed. Simultaneous or integrated design, better known as concurrent engineering, instead brings all relevant functions—design, manufacturing, quality, purchasing, and often suppliers and customers—together from the outset to develop the product and its production process in parallel. Because manufacturability, cost, reliability, and serviceability are considered while the design is still fluid, concurrent engineering shortens time-to-market, lowers cost, reduces late engineering changes, and improves quality. The trade-off is a heavier need for coordination, communication, and cross-functional teamwork.
A product must satisfy a broad set of design criteria that balance customer, business, and technical requirements. Functionality and performance ensure the product does what the customer needs reliably. Quality and reliability govern how consistently and how long it performs without failure. Manufacturability (design for manufacture and assembly) ensures it can be produced economically with available processes. Cost must meet a target that permits a competitive price and adequate margin. Safety and regulatory compliance are mandatory. Maintainability and serviceability affect life-cycle cost and customer satisfaction. Ergonomics and aesthetics influence usability and market appeal. Increasingly, environmental sustainability—material choice, energy use, recyclability—and standardization of components are essential criteria. Good design reconciles these often-competing criteria rather than optimizing any one in isolation.
Simulation models create a computer representation of a production process so that its behaviour can be studied without disturbing the real system. In tracking and diagnosing production, simulation is used to identify bottlenecks by revealing where work-in-process accumulates and where resources are starved; to test the effect of proposed changes—new layouts, additional machines, revised schedules—before committing capital; and to evaluate capacity and throughput under varying demand. Discrete-event simulation models the flow of jobs through work centres and quantifies queue lengths, utilization, and cycle times, exposing problems such as excessive waiting, unbalanced lines, or the impact of machine breakdowns. Because it captures variability and interactions that static calculations miss, simulation is a powerful, low-risk way to understand why a process underperforms and to compare remedies quantitatively.
A company developing a new electronic controller would run a concurrent-engineering team so that the board layout is designed for automated assembly from day one, apply design-for-manufacture and safety criteria against defined cost targets, and then build a discrete-event simulation of the assembly and test line. The simulation would reveal that the functional-test station is the bottleneck, justifying a second tester before the line is ever physically reconfigured.
