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A test plan may include:

The scope of testing
The Schedule
The Test Deliverables
THe Release Criteria
The Risks

The Test plan is generally delivered in two phases:
1. Master test plan.
2. Detailed Test Plan.

The above mentioned details are of a Master Test plan which is generally for all the components together in the entire application.
Where as the detailed test plan is generally for individual components of a component.

Master Test Plan contains:
Description of the components
scope of testing
Schedule of testing activities
Final Test Deliverables
Release Criteria
Risks and contingencies.
Bug severity and bug classification rules.
Test environment details.
Test Results storage.

Detailed Test Plan includes:
description of the component.
Test cases categories
a)security test cases
b)functional test cases
c)exception test cases
d)globalization test cases
e)performance test cases
Test cases themselves under each of the above categories..

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