Measuring the effectiveness of business intelligence programmes is something that I both speak and blog about regularly. In fact Measuring the benefits of Business Intelligence remains the most frequently read article on this site (with over 4,000 hits at the time of writing).
Ann All from IT Business Edge recently blogged on this topic and included some of my thoughts, starting at the foot of page 1. The article is entitled Will ‘Hair of the Dog’ Help Companies Measure BI Efforts?. I would recommend having a read.
You can also read another article on this site featuring Ann All: “Big vs. Small BI” by Ann All at IT Business Edge
You can follow Ann on Twitter at @all1ann