The present study investigates the problems of lexical collocation usage found in Thai EFL learners’ writing. The collocation teaching lessons in the present study were developed adopting Lewis’s (1993) Observe-Hypothesis-Experiment (OHE) lexical... approach and Presentation-Practice-Production (PPP) approach (Gollin, 1998). The aims were to solve lexical collocation error problems as well as to improve the students’ recognition of lexical collocations. Thirty-six Thai undergraduate students majoring