The Human Side of Enterprise
Source: https://archive.org/details/humansideofenter0000mcgr ↗
Theory X assumes people dislike work and must be coerced; Theory Y assumes people are intrinsically motivated and capable of self-direction.
McGregor's point was not that Y is correct and X is wrong, but that every manager's behaviour is shaped by an implicit theory about human nature — and that theory becomes self-fulfilling.
The framework still structures, usually without attribution, every conversation about trust, autonomy, and micromanagement in product teams.
When a company says it empowers teams but tracks hours and approves every decision, it is enacting Theory X under Theory Y language.
Short, readable, and foundational for understanding why organisational culture is not a values poster but a set of operating assumptions.