The primary purpose of the brainstorming technique is to facilitate divergent thinking to generate a large quantity of ideas in a relatively short period. The technique operates on the principle that quantity will eventually lead to quality. During a brainstorming session, criticism and evaluation are suspended to create a free-flowing environment where creative and even unconventional ideas can be expressed without fear of judgment. This focus on volume is a defining characteristic of the method.

B. This is incorrect. A core rule of brainstorming is to defer judgment and criticism. Eliminating ideas is part of a later, convergent thinking phase, not the brainstorming session itself.

C. This is incorrect. Brainstorming is about generating a wide range of options (divergence), not the detailed analysis of a few (convergence), which occurs after the initial idea generation.

D. This is incorrect. While some variations like 'brainwriting' may incorporate anonymity, traditional group brainstorming is typically a vocal and open activity, not an anonymous one.

1. AXELOS. (2010). Management of Value (MoV). The Stationery Office (TSO).

Section 6.3.2 (Brainstorming): This section describes brainstorming as a technique used to "generate a large number of ideas from a group of people in a short period of time." It explicitly states the four rules, including "quantity not quality" and "suspend judgement," which directly support answer A and refute B and C.

2. Osborn, A. F. (1953). Applied Imagination: Principles and Procedures of Creative Problem Solving. Charles Scribner's Sons.

Chapter 33 (How to Organize a Group for Creative Thinking): Osborn, the originator of the term, outlines the fundamental principles. He emphasizes that the "primary aim is to produce the largest possible number of ideas," which aligns perfectly with option A. He also introduces the principle of deferring judgment, which contradicts option B.

3. MIT OpenCourseWare. (2005). 15.351 Managing Innovation and Entrepreneurship, Lecture Notes, Session 5: Recognizing Opportunities. Massachusetts Institute of Technology.

The lecture notes on brainstorming techniques emphasize generating a "large number of ideas" and the rule of "no criticism" during the session, reinforcing that the goal is quantity (A) and that elimination of ideas (B) is deferred.