Data management is a complex process implying the following actions: structuring, editing, storing, checking, and archiving. It could be accomplished by using different sources, software, lead data enrichment tools, and programs. Companies, especially those involved in the sales industry, buy these off-the-shelf databases.
I'm interested in what ways do you use to gain data/information? How do you check the plausibility of the sources? It would be great if you will describe it thoroughly, thus raising the trustworthiness in front of your future clients.