An exercise in guided brainstorming: A project completed as part of my certificate in Managing Innovation and Design Thinking, HEC Paris, March 2020
I explain what the subtraction brainstorming technique is in this article

These sketches are the results of guided techniques in brainstorming, in this case, a rethink of a coffee shop. To start, I brainstormed a list of essentials of what makes a coffee shop. These essentials become the seeds for new ideas, depending on which technique you use:
This idea for individualized coffee "pods" came from using the replacement technique, in which you remove an essential part of something and replace it with another essential.
This idea for drive-thru cold brew growlers used the cropping technique, in which you move one essential from the beginning of the customer experience to the end. 

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