Quick & Dirty trees are undocumented trees built quickly in an attempt to identify a genetic match.
Quick & Dirty trees are built without extensive documentation or verification, solely as HINT GENERATORS, not as genealogical proof. Once a connection is identified, that connection can be pursued and the tree can be documented and verified.
This method has largely replaced the “Mirror Tree” method (in which a tree is built or copied and attached to a test taker’s DNA to generate Shared Ancestry Hints). A Quick & Dirty tree is NOT attached to anyone’s DNA.
Here’s the link to the AncestryDNA video by Crista Cowan and Angie Bush: https://www.youtube.com/watch?v=VP8rUlZbmeA
Here’s the link to DNA Central: https://dna-central.com