Seica Systems 9655 SE 36th St Ste 100, Mercer Island, WA98040 Seica Systems provides sales training for its clients, namely business people and entrepreneurs who want to improve…More their sales performance. The extent and type of training is tailored to the customer's needs. SEICA stands for Screening, Evaluation, Impact training, Coaching and Accountability. Owner Hal Thorsvig has operated this company on Mercer Island for eight years and for 10 years prior in Bellevue. A Mercer Island resident, Thorsvig says his company's mission is to help companies improve their bottom lines by creating overachieving sales people.