1 INTRODUCTION  

2 DATA REDUCTION AND SAMPLE SELECTION  

3 ABUNDANCE DISTRIBUTION AND RADIAL GRADIENTS IN THE M 31 DISC FROM PLANETARY NEBULAE  

4 COMPARISON OF RADIAL ABUNDANCE GRADIENT FROM M 31 DISC PLANETARY NEBULAE WITH GRADIENTS IN GALAXY DISCS  

5 CONSTRAINTS ON THE FORMATION HISTORY OF THE M 31 DISC  

6 CONCLUSIONS