Beyond the free Unit4 HR and payroll health check sit three commitments. They differ by what they produce.
A review answers the question a leadership team asks: what state the system is in, and what it would take to put it right. A diagnostic answers a narrower one: within a defined area, which configuration decisions and defects cost money now, in what order to correct them, and what each correction takes. A remediation programme assumes both answers exist and commits people to the work.
The common error is order. A programme is raised because the symptoms are loud, before anyone has written down what the system does, and its opening weeks go on discovery that one week of diagnostic work would have settled.
Before any of them, run the free twelve-question health check on this site. It shows whether the conversation is worth having.