PEST analysis ("Political, Economic, Social and Technological") describes a framework of macro-environmental factors used in the environmental scanning component of strategic management. It is a part of the external analysis when conducting a strategic analysis or doing market research, and gives an overview of the different macro-environmental factors that the company has to take into consideration. It is a useful strategic tool for understanding market growth or decline, business position, potential and direction for operations.

The growing importance of environmental or ecological factors in the first decade of the 21st century have given rise to green business and encouraged widespread use of an updated version of the PEST framework. STEER analysis systematically considers Socio-cultural, Technological, Economic, Ecological, and Regulatory factors.

The basic PEST analysis includes four factors:
Political factors are basically how the government intervenes in the economy. Specifically, political factors has areas including tax policy, labour law, environmental law, trade restrictions, tariffs, and political stability. Political factors may also include goods and services which the government aims to provide or be provided (merit goods) and those that the government does not want to be provided (demerit goods or merit bads). Furthermore, governments have a high impact on the health, education, and infrastructure of a nation.
Economic factors include economic growth, interest rates, exchange rates, the inflation rate. These factors greatly affect how businesses operate and make decisions. For example, interest rates affect a firm's cost of capital and therefore to what extent a business grows and expands. Exchange rates can affect the costs of exporting goods and the supply and price of imported goods in an economy.
Social factors include the cultural aspects and health consciousness, population growth rate, age distribution, career attitudes and emphasis...