SOLEC indicators are now divided into Tiers based on their level of readiness for use:

Tier 1 indicators are those which have enough data to be used in reports about the state of the Great Lakes.
Tier 2 indicators are good indicators that simply need more data so that they can report out to stakeholders.
Tier 3 indicators need further research before a decision can be made about their usefulness.

The GLEI effort will be examining the usefulness of many of the SOLEC indicators, plus developing new indicators for use by EPA.

To learn more about SOLEC and SOLEC indicators, view the SOLEC mini-presentation.