An impact assessment can be implemented in various ways. There must be planning as to who will collect the data and evaluate it. The impact assessment can in principle be carried out by project managers themselves (self-evaluation) or by independent third parties (external evaluation). There are a range of mixed forms in between (hybrid evaluation).
The following must be borne in mind:
Depending on the purpose of the impact assessment (e.g. for legitimising or learning), external experts or project managers must have the necessary independence so that they are perceived as sufficiently impartial and unprejudiced by those who use the results of the assessment
The team must have the requisite specialist and methodological competence to be able to carry out the evaluation correctly.
The team must have the requisite sensitivity and experience so that it can be accepted by those who use the results.