Sometimes building owners, asset managers or maintenance teams have to face a harsh reality when it comes to managing, maintaining and monitoring their assets. For example, what if a Housing Association has discovered cracking in the render of the external wall insulation system on some of their 1000+ properties? If the cracking is caught at an early stage, it could be easy and inexpensive to repair, but if left exposed to the elements unchecked, the repair bills could be costly. A different example could be a portfolio manager who has just acquired hundreds of properties across a low-medium seismicity zone (i.e. risk of earthquake). Could it still be considered negligent to not assess the risk of these buildings collapsing during a foreseeable earthquake? In some situations, it would not be acceptable to simply survey a sample of the buildings, as it is possible that these surveys could miss the buildings with the most significant damage. With these types of investigations only a review of every building will suffice; however, sometimes resources, availability and costs are limited so a full investigation cannot be carried out on every single building or asset.