Systems using a one-to-one model (such as Windows, Solaris , and Linux) schedule threads using process-contention scope (PCS).

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In a one-to-one model, each user-level thread maps to a kernel thread, and scheduling typically uses system-contention scope (SCS), not process-contention scope (PCS), which is more associated with many-to-one or many-to-many models where threads are managed within a single process by a user-level thread library.

Systems Using a One-To-One Model (Such as Windows, Solaris