Nowadays English language has gained its significance among a number of foreign languages such as French, Chinese, Russian, Japanese, etc. in the world as well as in Vietnam. The importance of English has been realized in Vietnam because English is considered to play a crucial role on the path of industrialization and modernization of the country. Therefore, English is now taught in almost every school, college, university and language centre all over the country. One of the main tasks assigned to foreign language teaching at school is that of training students to be communicatively competent. In an industrialized and modernized society, and in the time of globalization, communicative competence is required in the spoken as well as written form. It means communication can be conducted orally or in written documents. In many fields of life, being able to speak English is a necessity. For high school leavers, a good oral communicative competence in English may enable them to get a scholarship in a university in an English speaking country such as in the USA, in Britain, in Australia and so on, which is believed to ensure a much brighter future for them. Moreover, high school leavers who can speak English are easier to find a job with quite a big salary in a foreign company or a joint venture one, or to do an oversea job. Especially, graduates of a good command of English whose basic knowledge is what they obtain at school have a great deal of chances to be offered a good job with a big salary in a both state and private company. Thus, it is obvious that being able to speak English brings about a better career prospect. At Gia Loc senior secondary school, like at many other high schools in Vietnam, English has been a compulsory subject in secondary curriculum for many years. The fact is that, due to the demand of the senior secondary school graduation and university entrance examinations, the students' focus is on grammar and vocabulary, which means little attention has been paid to speaking skill. Besides, teaching English at school is mainly performed with a traditional method- the Grammar Translation method, which focuses mainly on grammatical and vocabulary items. As a result, students who are passive recipients become structurally competent but communicatively incompetent. While speaking may be a necessity for school leavers, and may serve as a “keystone” in successful communication, evidence shows that too many school students are unwilling to take part in speaking activities in class. This may be caused by many factors, among which is the lack of motivation. Motivation is one of the key issues in language teaching and it has long been believed to have a good impact on success or failure of a language learner. Skills and techniques to motivate students to practise the four basic skills, especially speaking skill, are essential for language teachers. Many researchers in the world namely, Gardner (1985), Ellis (1997), Littlewood (1998), Zoltan Dornyei (2001) and so on, have investigated what motivation is and what dimensions of motivation have effects on second language learning. In Vietnam, there have been a few studies on motivation of learners in English learning both in general and in particular skills such as speaking, listening, reading and writing. Yet no researcher has conducted investigation into the development of motivation in speaking skill for senior secondary school students in rural areas such as at Gia Loc senior secondary school.