Building performance analysis implies an effort to quantify building performance - in other words, to put numbers on 'how well' a building does what we want it to do. There are four main
approaches to do this: physical measurement/monitoring, computer simulation, expert judgment and stakeholder evaluation.
Unfortunately our toolset is not complete; there are performance aspects where some of the approaches simply are not yet available. In other domains, the outcomes may vary across the
quantification methods, leading to the notion of 'building performance gaps'.
A good solid understanding of what building performance is, and how to quantify it, is essential for all involved with building performance.