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The presence of an affordance is jointly determined by the qualities of the object and the abilities of the agent that is interacting.
This relational definition of affordance gives considerable difficulty to many people. We are used to thinking that properties are associated with objects. But affordance is not a property. An affordance is a relationship. Whether an affordance exists depends upon the properties of both the object and the agent.
The Design of Everyday Things
Don Norman
A bill of materials or BOM is a list of the raw components that go into a product. Most electronics projects, especially serious ones, will have a detailed BOM that describes the item and price that it goes for.
Often the final cost of the BOM will be much lower than the retail price because of the cost of shipping, R&D, profit margin, etc. Small changes in BOM price can have a big impact on the final cost of an item. It’s not uncommon to switch vendors or parts to save just cents on the BOM.
One trick I use is that multiplying the BOM cost by 4 will often get you the retail price.
Taking Over a Dead IoT Company
Kevin Chung
In late nineteenth-century Boston, this public health argument— that their own families would be safer and healthier because fewer people around them would be sick-was what convinced the wealthier residents to use their taxes to pay for a municipal water system and, new for the time, a sewage system to take the polluted wastewater away.
How Infrastructure Works
Deb Chachra
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