1 INTRODUCTION
1.1 Overview of previous studies on Sh2-252

2 OBSERVATIONS AND DATA REDUCTIONS
2.1 Optical CCD imaging
2.2 Hα slitless grism spectroscopy
2.3 Slit spectroscopy
2.4 Near-infrared data from 2MASS
2.5 Completeness of the data

3 RESULTS
3.1 Spectral classification of the optically bright sources in Sh2-252
3.2 Reddening, membership and distance of the bright sources in Sh2-252
3.3 Age and mass distribution of candidate YSOs in Sh2-252
3.4 Stellar contents of the sub-regions in Sh2-252
3.5 K-band luminosity functions of sub-regions in Sh2-252
3.6 Initial mass functions of sub-regions in Sh2-252

4 SUMMARY