How to determine the correct setting for JOB_QUEUE_PROCESSES

How to determine the correct setting for JOB_QUEUE_PROCESSES
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For this, you can create a table to insert the count value of running job in a particular time. then monitor few days or weeks , then decide what would be the correct value........
like below.

Parameter JOB_QUEUE_PROCESSES is maximum number of jobs that would ever be run concurrently on your Database.

1) First set JOB_QUEUE_PROCESSES higher than the most number of jobs that could ever run concurrently

2) Login as SYS

3) Create the table to do the monitoring

CREATE TABLE highest_concurrent_job (
SAMPLE_DATE DATE,
JOBS_RUNNING NUMBER);

4) Create the job to do the monitoring

CREATE OR REPLACE PROCEDURE DRP_highest_concurrent_job IS
BEGIN
INSERT INTO highest_concurrent_job
SELECT SYSDATE, COUNT(*) FROM  DBA_JOBS_RUNNING;
COMMIT;
END;
/

5) Create the job queue job to do the monitoring

DECLARE
v_jobno number;
BEGIN
DBMS_JOB.SUBMIT(
JOB => v_jobno,
WHAT => 'DRP_highest_concurrent_job;',
NEXT_DATE => SYSDATE,
INTERVAL => 'SYSDATE + (5/1440)');
COMMIT;
END;
/

6) select * from MAX_CONCURRENT_JOBS ;