The focus of this research is on Spanish heritage language (HL) and second language (L2) learners. An HL learner is a student who comes from a house where Spanish is spoken, but still; needs Spanish classes to master certain aspects of his/her first language. Sometimes English is also spoken at home: e.g., one parent speaks Spanish and the other English, or the student speaks Spanish with his/her parents but English with his/her siblings. On the other hand, an L2 learner is a student who is learning Spanish in a classroom setting. His/her first language may be English or any language other than Spanish. Between these two groups of students, there are important differences when it comes to learning Spanish, for example, L2 students are more knowledgeable about Spanish grammar rules and academic vocabulary. On the other hand, HL students have more fluency and much more knowledge about the culture. The focus of this research is on how the interaction between an HL and an L2 learner in a classroom impacts learning for both students. My role in this research is to transcribe the audio-recorded conversations between two L2 students and to compare these conversations with those between the same L2 students and an HL learner. I will analyze how the students collaborate and how they work to find the solution to any challenge they face that is associated with vocabulary, grammar or orthography. I hypothesize that pairing an L2 and an HL student will generate more interaction since each student offers different sources of knowledge. Pairing an L2 student with an HL student creates a diversity of ideas that I expect to increase learning. This analysis will help us to better understand how to create a more efficient learning environment, for both HL and L2 students, within mixed classrooms.