Who Are The Specific Personnel In The Industry That I Can Sell The Product Or Service?

You can contact the manager who would primarily be using your product or service for instance if you want to sell an idea then its better to contact the creative department of the advertising agency, if you want to sell the agency cameras than talking to a technical department manager would be a good idea.

You need to determine the range of use for the product or service. Meaning, is it useable globally throughout the prospect company or is it useable by only one department or one person in one department? The more people can use it, the more you need to focus on finding out if there is a centralized purchasing representative. You do this by asking the receptionist who answers the phone. "Excuse me, do you have a purchasing department?" or, "Excuse me, who in your company is responsible for the purchases of (xxx)?" And find your answer there.