Larry Selinker, an American linguistics professor emeritus from the University of Michigan, coined the term "interlanguage" in 1972 to describe the language system developed by second language learners. Interlanguage refers to the mental grammar constructed by learners as they acquire an L2. It is a systematic but variable system that draws on the learner's L1 and develops over time through stages, though it can become fossilized. Differences from L1 acquisition in children include language transfer, training transfer, communication strategies, and the risk of fossilization in L2 learners.

1. IN THE NAME OF ALLAH, THE MOST
BENIFICENT,
THE MOST MERCIFUL

2. Larry Selinker’s
Concept of
INTERLANGUAGE
(A Mental System of
L2 Knowledge)

3. Larry Selinker
Larry Selinker is an American professor
emeritus of linguistics at the University of Michigan. The
concept of Interlanguage (1972) is generally credited to
him; his article "Interlanguage" appeared in the January
1972’s issue of the journal International Review of Applied
Linguistics in Language Teaching.
Definition of emeritus /ɪˈmerɪtəs/
: a person retired from professional life but permitted to
retain as an honorary title the rank of the last office held

5. DEFINING INTERLANGUAGE
Interlanguage is the type of language produced by
second language learners who are in the process of
learning a language. While learning a language as
L2, the learners construct a system of abstract
linguistic rules which underlies comprehension and
production of the L2. This system of rules is viewed
as a mental grammar and is referred to as an
interlanguage (Ellis, 1997).

6. Some of the main premises with regard to L2
acquisition
1. L2 learners’ grammar is permeable
2. L2 learners’ grammar is transitional
3. Learners’ grammar is variable
4. Learners employ different language strategies
to develop their interlanguages.
5. L2 learners’ grammar is likely to fossilize

7. Characteristics of interlanguage
a. Interlanguage is systematic
b. Interlanguage is dynamic
c. Interlanguage is variable
d. Interlanguage is a reduced system, both in form
and function
e. Interlanguage can become fossilized

8. The differences between IL development in
SLA and L1 acquisition by children?
a. Language transfer from L1 to L2.
b. Transfer of training,
c. L2 learner’s strategies of communication,
d. Overgeneralization of the target language’s
linguistic material
e. The issue of fossilization

9. BIBLIOGRAPHY
Ausubel, D.P. (1968). Educational Psychology: A Cognitive View. New York, NY:
Holt.
Brown, H. D. (2002). Principles of Language Learning and Teaching. NY:
Longman.
Ellis, R. (1994). The study of second language acquisition. Oxford: Oxford
University Press.
Ellis, R. (1997). Second Language Acquisition. Oxford: Oxford University Press.
Ellis, R. (1999). Item versus system learning: explaining free variation. Applied
Linguistics . 20, 460-80.
Gass & Selinker (2008). Second Language Acquisition. London: Routledge.
Interlanguage . Retrieved from:
https://www.teachingenglish.org.uk/article/interlanguage
Troike, M. (2012). Introducing Second Language Acquisition. London: Cambridge
University Press.

10. Thank you:)