door-to-door selling

a method of presenting and selling products or services in which a salesperson goes to the residences or homes of potential buyers, knocking on their doors to solicit business

EXAMPLE:

"Many homeowners dislike door-to-door selling and consider it to be disturbing to their privacy."

feasibility test

(noun)

a procedure or basis for evaluation or assessment to see if something is capable of being accomplished or brought about, or is possible

EXAMPLE:

"A business will often do a feasibility test on a product before spending money to market it to consumers."