الفهرس 
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Abstract
This dissertation aims at examining the factors involved in the use of effective CSs in L2 speakers. These factors to be investigated are: attention control, analytic ability, proficiency level, and power relation among interlocutors as a social factor. The use of CSs in English L2 communication was assessed through assigning three main tasks to 43 adult Egyptian upper-intermediate to advanced learners of English as an L2. Effectiveness in CS implementation was measured by means of a double analysis approach, consisting of an assessment performed by raters, and the application of a systematic CS effectiveness measurement instrument, the mini-Delphi scale (Montero, Serrano & Llanes, 2013). As for politeness strategies of disagreement, the DCT test was applied (Takahashi and Beebe (1993) and Liang Guodong and Han Jing (2005)). The results of the present study suggest, first, that there is no significant effect of power on the selection of effective politeness strategies of disagreement. Second, attention control and analytic ability do not seem to be connected to the use of effective CSs in L2 communication. Finally the correlation between proficiency level and effective CS use seems to align with previous studies in indicating that more proficient L2 learners are more effective CS users. This dissertation makes an original contribution to the CS research area by studying connections that have presumably not been investigated before, such as the possible influence of attention control and analytic ability on CS use, and also the possible relation between power and selection of politeness strategies in oral L2 context.