PRONUNCIATION --- STRUCTURE --- VOCABULARY --- FLUENCY --- COMPREHENSION
Note: First familiarise yourself with this linguistic category by having a look at the respective level desriptors in the ICAO Language Proficiency Rating Scale.
This skill (interaction) addresses the ability to engage in spontaneous spoken dialogue and to successfully achieve communicative goals. Increasing proficiency in this skill results in reduced allowance or effort on the part of an interlocutor to maintain a conversation. It is characterized by the rapidity and appropriateness of responses, the ability to volunteer new information, to take conversational initiatives, to be responsive to feedback from an interlocutor, and to detect and to resolve misunderstandings as they occur. The learning processes involved in the development of interaction are:
a) exercises to acquire fluency and comprehension;
b) observation of interaction by others;
c) active situational practice with varied interlocutors.
Stage a) - c):
Advice on how to improve your English conversation skills...
Many good recommendations/ stuff for training can also be found here.