There are several conceptual views of interactivity, the most general being the contingency view. According to this view,
Interactivity is the degree to which in a communication process each message is related to the previous messages exchanged (Rafaeli, 1988).
This view defines three basic levels of interactivity:
Non-Interactive - when a message is not related to previous messages
Reactive - when a message is related only to one immediately previous message
Interactive - when a message is related to a number of previous messages and to the relationship between them.
Human communication is the basic example of interactive communication. Because of that, many conceptualizations of interactivity are based on anthropomorphic definitions. For example, complex systems that detect and react to human behavior are sometimes called interactive. Under this perspective, interaction includes responses to human physical manipulation like movement, body language, and/or changes in psychological states.
In computer science, interactive refers to software which accepts input from humans -- for example, data or commands. Interactive software includes most popular programs, such as word processors or spreadsheetapplications. By comparison, noninteractive programs operate without human contact; examples of these include compilers and batch processing applications. If the response is complex enough it is said that the system is conducting social interaction and some systems try to achieve this through the implementation of social interfaces.
Rafaeli, S. (1988). Interactivity: From new media to communication. In R. P. Hawkins, J. M. Wiemann, & S. Pingree (Eds.), Sage Annual Review of Communication Research: Advancing Communication Science: Merging Mass and Interpersonal Processes, 16, 110-134. Beverly Hills: Sage.
Interactions between drugs fall generally into one of two main categories; pharmacodynamic (involving the actions of the two interacting drugs), and pharmacokinetic (involving the absorption, distribution, metabolism, and excretion of one or both of the interacting drugs upon the other).
Other interactions may cause one medicine to have less or more effect than expected and these are usually managed by a dosage adjustment.
For example, the interaction of charged particles takes place through the mediation of the electromagnetic field whereas beta decay occurs by means of the weak interaction.
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