Strong consideration is currently being given to abolishing the schizoaffective concept and category from the revisions of the official psychiatric diagnostic classifications (DSM–V and ICD–11). This is likely to be unhelpful to the progress of psychiatric knowledge, given that it is emerging as a diagnostic entity that receives strong research support. We hope that psychiatry is moving towards the time when our patients can benefit from diagnostic concepts that are built on solid foundations of empirical biological evidence rather than being perched precariously on the shifting sands of expert opinion.