SPEC emphasizes working at multiple levels at the same time, but in their professional and activist roles most change agents target one or two levels in particular. This doesn't make SPEC irrelevant, though, because change agents at every level have limited success if they don't take into account the broader multi-level context. 

Specific techniques may vary depending on the primary focus of action. You can jump straight to the wiki page for the level that concerns you most:

• individuals
• groups
• organizations
• communities

Also on the Wiki

• Key stages for change agents at all levels to consider.
• A 2009  presentation offers a complete overview - Organizational Conditions Leading to Transformative Practice