4 ideas
The same cultural traits that drive a company's early success can directly cause its decline when market conditions change. DEC's engineering-driven culture of technical truth-seeking and consensus produced brilliant products but made it incapable of the disciplined, fast, top-down decisions required when computing commoditized.
DEC institutionalized the belief that the right answer emerges only when ideas survive aggressive challenge from technically competent peers, so subordinates were expected to refuse orders they couldn't logically defend. This produced rigorous engineering but paralyzed the company when problems had no provable technical answer and simply required someone to commit.
Every company contains an operator culture (those running the work), an engineering culture (those designing systems and seeking elegant solutions), and an executive culture (those focused on financial survival and control). These cultures hold incompatible assumptions, and an organization fails when their conflicts go unrecognized and unmanaged rather than reconciled.
Founder Ken Olsen deliberately fostered internal competition and resisted imposing strong central authority, believing that letting groups fight it out would surface the best ideas. As the company grew this left product lines duplicated and unfocused, and his personal reluctance to fire or override talented people meant strategic conflicts persisted until they consumed the company.