No single or common definition, or even a shared basic understanding, of Territorial Impact Assessment (TIA) currently exists. The conceptual background of TIA is focused on Territorial Cohesion (TC), which, in turn, also lacks a single definition. TC has a strong connection to Services of General Interest (SGI) as these services are a crucial element of the Cohesion Policy. This paper is a spin-off from the ESPON SeGI project and aims to discuss the applicability of TIA on SGI. The analysis is focused on an ex ante evaluation of TIA and on the methodology of critical evaluation. The findings suggest a rather limited applicability as an undefined concept (TIA) is based on another undefined concept (TC) to measure the impact on a third vaguely defined concept (SGI). Moreover, the particularities of each SGI may be related to economic and social changes that themselves may or may not be territorially reflected.