Balanced bilinguals are people who have equal proficiency in both their first language (L1) and second language (L2). However, balanced bilinguals are not common as people rarely use two languages in the same situation. Balanced bilingual tends to refer to a group of privileged people who have the choice and opportunity to use two languages, and who have the educational chances for both their languages to blossom. 

Research on bilingualism tends to show that children who are balanced bilinguals may have some cognitive advantages over those who are monolingual. Many contemporary studies have reported positive cognitive effects of balanced bilingualism, especially regarding metalinguistic skills (i.e., the ability to look at language rather than through it to the intended meaning). By and large, studies that have administered metalinguistic tasks such as grammaticality judgment tasks, word awareness tasks and phoneme segmentation tasks to groups of balanced bilingual and monolingual children of comparable ages report superior performance by the bilingual children; the latter group shows greater levels of control and analysis, which are fundamentally metalinguistic skills. 

- Plurilingualism

- Multilingualism

- Paralinguistics

- Bilingualism

- Third language acquisition

- Metalinguistic awareness

- Second language acquisition

- Minority languages

- Majority languages

- Immersion programs

- Areas of language proficiency: phonetics, lexis, syntax or pragmatics.

- Sociolinguistic context

- Models of plurilingual education: additive plurilingualism or subtractive plurilingualism

- Bilingual literacy

- Mother tongue.

- Additive bilingualism or substractive bilingualism

- Social language competence and academic competence

- Balanced bilingual, less-balanced bilingual or limited bilingual

- Linguistic interdependence

In my opinion these could be the most relevant key words in the articles and the presentation:

·         Bilingualism

·         Plurilingualism

·         Multilingualism

·         Foreign language

·         Interdependence

·         Contexts

·         Communication skills

·         Communicative competence

·         Native speaker

·         Base language

·         Language teaching-learning

·         Majority language

·         Minority language

·         Lesser-used language

·         Psichosocial factors

·         Methalinguistic awareness

According to the interdependence hypothesis (Cummins, 1991) bilinguals are able to transfer skills from their first language for use in their second language and it could be expected that they can also be capable of transferring skills from the two languages they know to a third language.  This Linguistic Interdependence Hypothesis reveals the relationship of the first language to the learning of another second or third language. Cummins' theory postulates two dimensions in every language: 

Languages contain surface features but, underlying these surface manifestations, there are more complex language features which are used in more cognitive demanding tasks and transferable across languages The dimension of language used in more cognitively demanding tasks that involve more complex language is CALP (Cognitive Academic Language Proficiency), which is transferable across languages.

The sociolinguistic context and the level of bilingual proficiency can explain why learners with a minority language as their first language have advantages when their L1 is valued in society and they have acquired literacy skills in their L1 as it is reported in most of the studies on the general effects of bilingualism.

- Language proficiency

- Social language competence

- Academic language competence

- Cognitive development

- Language acquisition 

- Acquired natural language

- Native language

- Minority languages
- Majority languages

- Linguistic interdependence

- Linguistic Interrelation

- Metalinguistic awareness

-Plurilingualism

-Multilingualism

-Paralinguistic

-Bilingualism

-Metalinguistic

-Additive bilingualism

-Third language acquisition

-Early bilingualism

-Balanced billinguals

-Minority language

-Authochonous languages

-Natural languages

-Foreign language

-Monolinguals 

-Bilinguals

-Trilinguals

-Proficiency

-Communicative skills

-Cognition

The key terms/ key word I have chosen to do the research is Bilingual.