I think you've got me all wrong.
Most posts are short and lack detail, but often give an impression. None of us have enough time to do a good job of accurately expressing our changing opinions - which would be a waste of time in most cases. It's all just food for thought.
Fannie's minimums are fine for many assignments.
My theory is:
1. That we are dealing with a system where the real culprit is BIAS that enters the picture at all source of entry points, because of GREED. For example, pressure to overvalue by mortgage brokers who's main motive is making their deals happen.
2. CONSISTENT BIAS in the system (lending) leads to POSITIVE FEEDBACK LOOPS ( a term in System Theory) which occur when market participants start to rely on the BIAS in making their decisions (e.g. purchase price). These POSITIVE FEEDBACK LOOPS are what make the system instable (as exemplified by the current mortgage "meltdown").
So, it's not so simple: you can't just say that if the LTV is only 80%, of if the prices have bottomed out, appraisals don't need to be that accurate. ONCE you say that appraisals don't need to be accurate, you open the door to BIAS. And the "system" is too weighted with inertia to make a fine distinction between cases were accuracy is needed and where it is not.
But to be practical, I would prefer an Either/Or system where AVMs are used for those cases where accuracy is not needed - because they (AVMs) can be engineered (as software programs) to protect against bias and where, on the other hand, appraisers are used only when accuracy is needed. When appraisers enter the picture, USPAP constraints should apply in full force. - And for all practical purposes, that means full appraisals - as a general policy. I think that is where USPAP is headed. The SOW is really not that flexible on the soft side, because of the "reasonableness" criteria - that's the way it should be. I think the grey area between AVMs and full appraisals will eventually be eliminated.
Now, having said that, there is, possibly, room for an "Appraiser Assisted AVM". This is, in my opinion what Zaio is trying to do. The result is something that should not be signed by an appraiser. The appraiser would only provide approximate scoring of property features based on the best available evidence. But of course, as soon as human intervention is allowed, in the form of scoring, bias is likely to enter the picture. You can avoid this largely by scoring all properties in a single sweep, rather than on demand for a particular transaction. But, then you have to maintain a PUSH system. These are largely very inefficient, as is well known in the manufacturing industry - which prefers PULL systems (build to order). We already have a PULL system for independent fee appraisers that is fairly efficient. Zaio's PUSH system is, in fact, a backward innovation. The people who created it are incompetent as systems analysts, IMHO. So, where does this leave us, in my opinion? "Someday" all real estate data will be stored in computers. Everything. Pictures of the interior taken and so on. We are already partially there with a variety of MLS systems, which contain numerous exterior and interior photos of properties, along with video. The problem with these systems, is lack of standardization, quality control and the fact that the data only covers listings that have been entered in the last 10 years. But these systems will eventually improve and be tied into AVMs. Appraisers will likely be called in to fine tune the AVMs - in a way that ensures lack of bias. This is probably 15+ years off on a national basis. ... Even then, residential appraisers will still be needed for more accurate appraisals, - and many will surely find their specialty to be appraising for AVMs rather than mortgage brokers or lenders.
Bert Craytor, SRA