Broadly speaking, there are two distinct types of soccer teams in this state.
Those are recreational teams (rec) and competitive teams.
Generally speaking, rec teams are formed up either by a first come, first served sign up basis, or on the basis of the player's location (neighborhood/school).
Competitive teams are normally formed by tryouts. Under some circumstances, invitations (recruiting) can also be used.
Rec teams are most common at the younger levels.
It is rare to see entire leagues formed up of Rec teams at the teenage years.
Competitive teams are further distinguished by the level they play at, which is normally denoted by a geographic area (District, State, Inter-State).
Comp teams that play in a district league (There are 7 districts in Washingon state, not all offer leagues/age groups for all possible teams) are normally called select teams.
Comp teams that play in a state wide league are broadly known as "Premier" teams. This designation was from the old state wide Premier leagues. The PDL and now the RCL have replaced the old Premier Leagues. To many, the term "Premier" still denotes any team playing in a state wide league.
Comp teams that play in an Interstate league are a new development (except for ODP). These are "Academy" and "ECNL" teams. The popularity among clubs and parents for the interstate competition has given rise to new competions (Western Developmental Academy League, other "Academy Lite" leagues ) and new Champions League type comptetitions (Western Regional League, NWCL). As long as the parents continue to shell out for these things, they will continue to grow.
A Standard view of the traditional soccer pyramid is that each level feeds off the level below it.
There is not, and never has been, any requirement that because a team is able to compete successfully at a higher level it is forced to move there. In the past, there actually was opportunities (and often encouragement) to do so. Currently, the model that the WSYSA embraces pretty much prohibits upward movement of teams. Players are expected to leave their current teams and migrate to the designated teams at the higher levels. Other than the WSYSA sanctioned Sounders program, the WSYSA has no real policy concerning the rest of the Academy type leagues and teams, and often does not differentiate them from regular state league level teams.
Please note that currently, state league pretty much means RCL and only RCL. The so called "state open leagues", such as (barely) exist, are akin to the old time hybird leagues known as the IntraSitrict Leagues (IDL) which were designed for select (district) teams that wanted a more rigorous schedule but could not QUALIFY for state league competition.
Because of current restrictions on teams qualifying for higher level league play and status (designed to maintian the current RCL franchises and feed players into them), the classifications of teams are becoming less and less to do with the quality of the teams themselves, and more to do with the quantity of the finances available.
Comments or corrections?