Time valuation with and without clock times --- Plzz help

Question

hi experts
Please help me by explaining the following.
1) Please explain me the differnces between time valuation with
   clock times(T555Z) and time evluation without clock time(T555Y).
2) Please explain the differences in time types and processing types and functions procedure used  in time                evaluation with clock time and in time evaluation with out clock times.
3) What is the major differences in the schema between time evaluation with clock times and with out clock   time?
Thanx in advance for help and Points will be rewarded in full.
regards,

Answer 1

WITH CLOCK TIME
It processes time data that has been imported to the SAP system from time recording subsystems and data that has been recorded online. Those time events (in/out timing) will be stored in 2011 which will be used in schema processing.
Without clock time
to evaluate the time data of employees who enter only exceptions to the work schedule. Processing in this component assumes that times are expressed as the duration of work, and not the start and end times of work times and employee absences
Clock times are not required for evaluation of time data
T555y is used for processing work times  (function Types)
T555z is used for breaks processing in time schemas (function Types)
2. NO difference in the way they are used
3. Schema TM00 (clock times) is a standard schema, used to evaluate employee time data that has been recorded at time recording terminals and that specifies clock times.
Schema TM01 is a standard schema used to evaluate the time data of employees for whom only deviations from the work schedule are recorded.