2.1 Analysis of Context

Purpose． Good arguments have a clear purpose.Referring back to the continuum that measures the degree of an argument’s attention to audience and to truth， we can classify the purpose of an argument into four major types；（1） to convince readers that the claim and its supporting evidence and logical reasoning make a reasonable argument or position about an issue；（2） to convince readers and seek readers’ partial or full agreement with a reasonable and well-justified position or argument；（3） to solicit full agreement from readers about a position or argument and call for readers to take some actions．

Kairos .To achieve its purpose， an argument， especially a persuasive argument，needs to consider the context or situation in which the argument is delivered. Kairos constitutes the core of the context； to a large extent， the success of arguments largely depends on their kairos .In this sense， it is often used interchangeably with situation or context.In Greek， kairos means the opportune timing for an action. Kairos refers to qualitative and psychological time different from another Greek term for time， chromos，which means a quantitative， chronological， and sequential time.To Aristotle， kairos means both time and space in which an argument is delivered.To the classical rhetoricians， in order for an argument to be effective， the speaker or arguer must be well aware of the situation， capture the most opportune moments appropriate for an argument， and make the argument well attuned to those moments． KdcrM7A6aoUEFmrxZ8wCWUVJdBWDG3S9EofVAbBbbCpjlGLvzdLrrUaNrzrS7r36