Relating that to the C150/152 - the original topic of conversation - I used find it was an excellent trainer for stalls. I could predictably arrange quite benign stalls and then increase the 'sharpness' (not a good term but it'll suffice) just by changing flap, power &/or pitch/roll attitude - all while confining pitch & roll to within normal flight limits. I found it was quite able to demonstrate what would happen if incorrect control inputs were used.
No strange techniques I think, just taking advantage of the aircraft's benign straight & steady stall behaviour power off & clean then gradually applying flap or angle of bank or power + plus a bit of judicious choice about what direction to turn with power applied. Compare a straight & steady stall/power off compared to one in a climbing right turn at 15 or 20 deg AoB, for example.