Dewey Decimal Systems often vary slightly between libraries that specialize in different subjects.

Regulators are increasingly scrutinizing shadow banking systems to prevent systemic risk.

Researchers compared the accuracy of several satellite navigation systems under different atmospheric conditions.

Researchers compared the stability of various three-party systems across different regions.

Astronomers discovered several triple star systems in the dense region of the star cluster.

Many former colonies adopted Westminster parliamentary systems after gaining independence, shaping their political institutions for decades.

In several countries, two-party systems have long shaped government policy and limited the choices available to voters.

Research engineers compared the accuracy of hyperbolic navigation systems under various atmospheric conditions.

Scientists compared innate immune systems across several species to understand early defense mechanisms.

During the summer, mesoscale convective systems frequently organize over the plains, producing heavy rainfall and damaging winds.