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When studying the evolutionary stages of protostars that form in clusters,the role of any intracluster medium cannot be neglected. High foregroundextinction can lead to situations where young stellar objects (YSOs) appear tobe in earlier evolutionary stages than they actually are, particularly whenusing simple criteria like spectral indices. To address this issue, we haveassembled detailed SED characterizations of a sample of 56 Spitzer-identifiedcandidate YSOs in the clusters NGC 2264 and IC 348. For these, we use spectraobtained with the Infrared Spectrograph onboard the Spitzer Space Telescope andancillary multi-wavelength photometry. The primary aim is twofold: 1) todiscuss the role of spectral features, particularly those due to ices andsilicates, in determining a YSO's evolutionary stage, and 2) to performcomprehensive modeling of spectral energy distributions (SEDs) enhanced by theIRS data. The SEDs consist of ancillary optical-to-submillimetermulti-wavelength data as well as an accurate description of the 9.7 micronsilicate feature and of the mid-infrared continuum derived from line-free partsof the IRS spectra. We find that using this approach, we can distinguishgenuine protostars in the cluster from T Tauri stars masquerading as protostarsdue to external foreground extinction. Our results underline the importance ofphotometric data in the far-infrared/submillimeter wavelength range, atsufficiently high angular resolution to more accurately classify clustermembers. Such observations are becoming possible now with the advent of theHerschel Space Observatory.

Disentangling protostellar evolutionary stages in clustered environments using Spitzer-IRS spectra and comprehensive SED modeling