test strategy is overall description and test plan is 
detailed instructions for caryying out testing.

First comes the Test Strategy and later comes the test plan.

There can be multiple test strategy, but only one plan of 
execution.

Test Strategy to be done along with Management and Test 
plan to be done along with the team

Test Strategy decides the time lines. Test plan executes 
based on the times lines.

You cannot change the test strategy once its freezed. But u 
can change the test plan even though if its freezed.

i will be as simple as possible :


Test Plan : What we are going to test
            What we are not going to test
            How many resources we need
            Scope
            Risk
            Timeline
            Tools to be used ( Automated / Performance /  
Bug Tracking / etc )
            Our Company has 18 features in its test plan

Test Strategy : How are we going to test that are planned?

Please Feel free to mail me @ karanth.sriharsha@gmail.com

Test stratagy is the  testing approch which testing types u 
can  develope for the testing.
Test plan is nothing but a  project level doucement which 
provides wt r the testing to be coverd,shedule of the 
testing and all the imformation about the testing is 
aviliable.

Test Plan: Test plan is a document that describes the 
objectives,scope,approach,and focus of a s/w testing effort.

Test strategy:How are we going to test that are planned for 
a given application?

Test Strategy is the part of Test Plan.

Test Strategy is the overall approach of the test process
Test plan is the detailed approach of the test process

First Comes:Test Strategy

   It should be developed each and every project.
It Contains:-When will testing occur,what kind of testing 
occur,testing objectives,goals,risk.

Second Comes:-Test Plan.

  Details of testing process.

TeST PLAN: test plan is a strategic document which 
describes how tp perform testing in an appropriate and 
accurate and efficient manner.

Test strategy: test strategy is a organisation level 
document which is used for all the projects in the company.

test cases is a project level documernt which is used for a 
particular project.

Test Plan:-
It contains item to test.
1)revision History
2)Introduction
3)Objective
4)Process
5)Test Strategy
6)Exit/Entry criteria
7)Schedules
8)Milestone
9)Delevariable
10)Commands
Test Strategy:-
Item how to test
White box testing 
Black box testing
Gui testing
Database testing
Automation testing
Item to Test
Item not to Test
These are all Test strategy

Test plan
    It means simply,it is road map for the entire testing 
acitivity.In that we have to mention what type testing we 
are going to test the application,and scope,objective,Roles 
and responsibility,resources,schedule,communication 
approach,risk management etc.

Test strategy
   It  means what type testing we are going to do in the 
application,which type of testing techquies we are going to 
use in the application like that.