The integrated situation is the most important stage after achieving each "lesson" [learning Objectives] so for the levels {1st - 2nd - & 3rd AM ] it would be better to tackle the integrated situations at least once in each sequence ,for the fourth level the " write it up & write it out " are tackled as integrated situation
so it would be better for the teacher to tackle a problem solving situation after each lesson if possible in order to make the learners perform them as much as possible
good luck
here is the link
https://www.4shared.com/file/17615373...pproach__.html