The city's public address systems were tested every month to ensure they functioned during emergencies.

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.

City planners are investing in intelligent transportation systems to reduce congestion and improve safety.

The Hennebique system, introduced in 1892, revolutionized construction with its use of reinforced concrete.

The researcher developed a mathematical model to analyze the stability of a chaotic dynamic system.