Deciphering the skeleton of Peoplesoft HRMS modules

The more I get to work on various modules, the more I find similarities between their basic architecture. For example, sample the architectural similarity between Payroll for North America, Time and Labor and Absence Management.

NA Payroll T&L Absence Management
Paygroups Workgroups GP Paygroups
Earning Program TRC Program Element Group
Earnings/Deductions TRCs Absence Takes
Calendars NA Calendars
Pay Run ID NA Calendar Run ID
Company NA Pay Entity
NA T&L Rules Formulas

It has also been my experience that almost all modules in Peoplesoft HRMS is designed to link the smallest functional unit of that module to the employee. For example, the smallest unit in T&L in TRC and everything that we do in Time and Labor is designed to link the correct TRC and quantity to an employee. The same would be the case for Absence Management and NA Payroll where the smallest unit would be an Absence Take and Earnings/Deductions respectively. Once you have this fundamental understanding, everything else will automatically fall in place.
Another powerful analogy is to an inverted pyramid where the smallest unit of the module will be at the tip at the bottom and the employee on the flat base at the top. The architecture of most modules I know builds up like an inverted pyramid from the smallest unit to aggregate in size and finally attach itself to an employee.

A simple example from Time and Labor would be the case of how a TRC is linked to an employee. At the bottom of the pyramid there is the TRC, above that is the TRC Program, above that there is the workgroup and finally at the base there is the employee. You can seamlessly extend this analogy to other modules as well.