This paper discusses the concept of "noticing" (Schmidt, 1990; cf. Smith, 2010) in relation to text-based second language interaction (instant messaging). Data has been collected at an upper secondary school, where students of English as a foreign language interact with the researcher, providing feedback on language and content. In addition to chat logs and screen recordings, data from keystroke logging and eye tracking have also been collected, enabling analysis of both verbalized and non-verbalized signs of noticing (cf. O'Rourke, 2008; Smith, 2010). The focus of this paper is on how signs of noticing can be defined in this context, and preliminary results concerning the relationship between noticing and different types of corrective feedback are presented. [For the complete volume, see ED574893.]