An IT governance body wants to determine whether IT service delivery is based on consistently...

 The best approach to determine whether IT service delivery is based on consistently effective processes is to evaluate key performance indicators (KPIs). KPIs are measurable values that demonstrate how effectively an organization is achieving its key objectives. KPIs can help the IT governance body to monitor and assess the performance, quality, and efficiency of the IT service delivery processes. KPIs can also help to identify areas for improvement and benchmark against best practices or industry standards. References:

CISA Review Manual (DigitalVersion), Chapter 1, Section 1.3.21

CISA Online Review Course, Domain 5, Module 2, Lesson 22