1. Introduction

2. Input data & the model fitter
2.1. Mid-IR imaging
2.2. 2MASS
2.3. Sub-millimetre and Millimetre Continuum
2.4. Kinematic Distances

3. Fitting the spectral energy distributions of young massive stars

4. Results
4.1. Sources Without Far-IR Data
4.2. Filter Effects

5. Discussion
5.1. Comparison with Other Methods
5.2. YSOs
5.3. H II Regions
5.4. Comparison of YSOs and H II Regions

6. Conclusions