Which production method involves the assembly of low-variety discrete products at high volume?

The correct answer involves the concept of batch flow, which is characterized by the production of a limited variety of products but does so in high volumes. In a batch flow production method, similar items or products are made in groups or batches. Each batch undergoes the same set of processes, allowing for efficiency and lower costs associated with setups and changeovers between different products.

This method emphasizes quantity over extensive product variety, which aligns with the objective of producing discrete items rapidly and efficiently. The assembly line often used in batch flow enables streamlined operations and maximizes throughput by reducing the time and resources spent on producing each individual product.

In contrast, the other methods detail different production approaches. For example, a job shop typically caters to low volume and high variety, focusing on custom or unique items rather than mass production. Mass customization combines low volume with a degree of customization, allowing consumers to personalize products within certain limits, which does not match the high-volume aspect of the question. Project production is employed for one-time or unique operations like construction, which does not fit the traditional assembly and high-volume focus of batch flow.