Biological communities are rarely stable. Their composition is constantly changing, depending on the environmental conditions ...

Since 2001, I have been developing a new framework and theory--psychology of working--which represents an innovative way of understanding and intervening in the work lives of everyone who work and who ...

After World War II, health was firmly integrated into the discourse about national development. Transition theories portrayed health improvements as part of an overall development pattern based on ...

The terms theory and model are defined, and students learn how a theory remains valid. Atomic Theory: The Development of the Atomic Theory: The terms theory and model are defined, and students learn ...

Economists develop economic models to explain consistently recurring relationships. Their models link one or more economic variables to other economic variables. For example, economists connect the ...