(SPARK) is an inter-industry professional association servicing mutual fund companies, banks, insurance companies, investment advisors, third party administration, record keepers and benefit consulting firms in the retirement plan industry

401khelpcenter a knowledge service that curates — finds, reviews, organizes and shares — the best and most relevant information for people who sponsor, advise, design, administer, make policy about, participate, or are otherwise interested in 401k and 403(b) plans.

Deparmtent of Labor Employee Benefits Security Adminstration. The mission of the Employee Benefits Security Administration is to assure the security of the retirement, health and other workplace related benefits of America’s workers and their families. We will accomplish this mission by developing effective regulations; assisting and educating workers, plan sponsors, fiduciaries and service providers; and vigorously enforcing the law.

Some useful tables about defined contribution and defined benefit plans: Here

Description of target date fund:Here

A 401k plan trustee:
http://www.verisightgroup.com/Home/Solutions/TrustServices.aspx