Test workbench: test plan, test package, test case, test script, test tools

i want to understand SAP terminology regardsing 'test workbench' terminology - its functions and its sequence.

we creat test plan first , than test pacakge than assign it to tester.

can u give sequence of this tcode and its function if u can provide documentaion too,

tcodes:

STWB_TC

STWB_1

STWB_2

SCAT

AND SECATT

STWB_WORK

i mwan what are the first step to last step regarding Testworkbench.

thanks,

regards.