Final answer:
Janice is using the promotional technique of gathering information from potential clients to identify prospects, which helps in future sales and promotional efforts.
Step-by-step explanation:
Janice's promotional technique by having individuals fill out a form with their information is primarily aimed to identify prospects. By gathering contact information from interested representatives at the trade show, her company can later reach out and potentially convert these prospects into clients. This method is important not only for the initial introduction of the company's products but also for establishing a database of leads that can be contacted for future sales or promotional offers.