The study attempts to provide the explicit information and form-focused tasks for teaching Korean perfect aspect markers, ‘-e iss-’, ‘-ko iss-’, and ‘-ess-’. The analysis on the current Korean text books has shown that the information on Korean perfect aspect markers was presented in an isolated way and the tasks were confined only to pre-communicative activities on each markers. We found the need to differentiate the markers in terms of aktionsart and transitivity. The current study has presented four collaborative output tasks including the Dictogloss, Reconstruction cloze task, Text-editing task, and Collaborative output jigsaw task to facilitate the L2 learners’ meta-linguistic information, learner attention, and increase learner involvement. (Ewha Womans University)