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ECA(Event Condition Action): 

ECA : It is a combinition of 3 things: an event, conditions per event, and actions per event. It is a rule used to trigger an action upon the execution of an event when certain conditions are met. When a service is called for example a lookup is performed to see if any ECAs are defined for this event. Events include before authentication, before IN parameter validation, before actual service invocation, before OUT parameter validation, before transaction commit, or before the service returns. Next, each condition in the ECA definition is evaluated and if all come back as true, each action is performed. An action is just a service which must be defined to work with the parameters already in the service's context. There is no limit to the number of conditions or actions each ECA may define.
For more details on this visit :  Service Engine Guide
1. SECA (Service Event Condition Action) : This is used when we want to trigger another service(action) on the execution of a service when certain conditions are met.
2. EECA (Entity Event Condition Action) : This is used when we want to trigger a service on the creation of a record for an entity when certain conditions are met.
For the implementation of ECA again we will be following the same approach for screens, menus by following steps:
Step - 1 : Add one more application menu named "ECA" to the practice application's menu bar.(Do the needful entries for target in controller.xml)
Step - 2 : Now create another menu called "EcaMenu" in the PracticeMenus.xml file. This menu will have two menu items named "seca" and "eeca". For each of these, two screens will be needed that use the "CreatePerson" form which we created above. (in personForm screen)

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