Accurate species delimitation underpins good taxonomy. Formalization of integrative taxonomy in the last decade has provided a framework for using multidisciplinary data to increase rigor in species delimitation hypotheses. We address the state of integrative taxonomy by using an international project targeted at resolving three important tephritid species complexes (Bactrocera dorsalis complex, Anastrepha fraterculus complex, Ceratitis FAR complex) as a case study. The integrative taxonomic approach helped deliver significant advances in resolving the complexes; from identifying some taxa as being same biological species, to confirming hidden cryptic diversity under a single taxonomic name. Nevertheless, the widespread application of integrative taxonomy was not without issue and revealed challenges that must be considered when undertaking an integrative taxonomy project. Scrutiny of this international case study provides a unique opportunity to document "lessons learned" for the benefit of not only tephritid taxonomists, but also for the wider taxonomic community