Try reading the studies by Canale and Swain, Bachman and Palmer.

Dear Kanchana Prapphal,

As a new catchword in education, constructivism tends to address how people learn. Accordingly, it suggests that learners construct knowledge for themselves. As a consequence, constructing meaning materializes  learning. The idea is deeply rooted in the philosophies practiced by Piaget and Vygostsky. The latter, in particular, maintains that meaningful  negotiation between the expert and the novice can result in learning. Therefore, to actualize the full potentiality of a learner's linguistic competence, it is  necessary to adopt  an interactive approach in which the affective support provided by the teacher/expert can establish a meaningful rapport helping the individual's progress and learning.

Best regards,

R. Biria 

Dear Nata:

Besides Piaget and Vigotsky, it is crucial to include the contributions of: Jerome Bruner, Howard Gardner, and Nelson Goodman, who are interested in learning.

You may also  take into account the views of:

a) Ilya Prigogine (at Adlerian, Cognitive, and Constructivist Therapies: An Integrative Dialogue by Richard E. Watts);

 b)  Humberto Maturana and Francisco Varela (Some Differences between Maturana and Varela's Theory of Cognition and Constructivism  by Jérôme Proulx).

 You may also look alter the following  constructivist authors:

 Murray Gell-Man, Betsy Dyer, Stuart Kauffman, and Per Bak, Ernst Mayr,  Wolfgang Krumbein, Lynn Margulis,

It is interesting to review:

Constructivism: Theory, Perspectives, and Practice, Second Edition

Best regards, Luisa

thanks

Check this link out: 

http://www2.leeward.hawaii.edu/hurley/Ling102web/mod1_popideas/mod1.7_comvsperf.htm

Are you sure you mean learning, not acquisition? In the latter case you need Michael Tomasello by all means - 'Constructing a language' 2003

thanks

 I think you could read Canale and Swain, Bachman,  Bachman and Palmer, Celce murcia

thanks