Three vital components for movement formation are the following: •
Insurgent consciousness: certain members of society feel deprived, mistreated, and have grievances directed at a system that they perceive as unjust (see also
deprivation theory). When a collective sense of
injustice develops, it motivates people to become movement members. There are various definitions of political opportunity, but Meyer (2004) stresses that of Tarrow (1998): From the three components there emerges a proponent term which Doug McAdam coined as cognitive liberation, the ability for those active in
political protest to recognize their collective strength and take advantage of political opportunities as they become available to them. As political opposition to the movement's demands weakens, members may feel a collective sense of symbolic efficacy, the capacity to enact significant change within the political arena. This opens up significant opportunities for movements to both recruit members and mobilize under a concentrated and effective cycle of demands. Over time, the broad socioeconomic processes develop, maintain and cause decline within the movement. A movement, once developed, may be affected by the level of social control placed on it, which, in turn, affects its ability to mobilize and maintain members since when the movement's demands are portrayed as underdeveloped or unattractive, they risk losing or failing to receive support from outside institutions. Furthermore, movements may be affected by oligarchization, a class of individuals within the movement working to ensure the maintenance of the movement itself, rather than a continual push for collective goals, or co-optation, when outside support is garnered for the movement at the same time as it is forced to sacrifice its goals to meet the demands of those supporting institutions. That, in turn, may lead to the loss of indigenous support and, along with it, many of the supporting grassroots organizations that were able to quickly mobilize members at the onset of the movement. Meyer (2004) credited Eisinger (1973) with first use of the political opportunity theory framed in such a way (traces of which, of course, go further back). Meyer (2004), in his overview of political opportunity theory, noted that this broader context can affect: • "mobilizing", • "advancing particular claims rather than others", • "cultivating some alliances rather than others", • "employing particular political strategies and tactics rather than others", and • "affecting mainstream institutional politics and policy". A key advantage of the theory is that it explains why social movements emerge and/or increase their activity at a given time. When there are no political opportunities, simply having grievances (organizational consciousness) and resources is not enough. It is only when all three of these components are present that the movement has a chance to succeed. ==Comparison with political structure==