Notes

Outline

LEA Section 1, Chapter 2 : LEA Model By John Chi-Zong Wu August, 2006 www.e-cio.org © reserved

The wisdom A wise man learns by the experience of others. An ordinary man learns by his own experience. A fool learns by nobody’s experience.

Pyramid Model

LEA learns by experience of  others

LEA is a Twin Pyramid model

The difference of reuse and sharing The engineering of reuse and sharing sound redundant. However, there is significant difference between the engineering of reuse and sharing. We share a pie but do not reuse a pie. It is totally different. Sharing is more physical to divide the pipe among the number of people. Reuse is from the logical aspect to reuse the recipe.

The physical & logical architecture Engineering of reuse is consider as logical architecture. Engineering of sharing is considered as the physical architecture. Logical architecture is defined base on business logic. Physical architecture is a function of workload distribution and performance requirements.

The product and enterprise definitions

Engineering of reuse

Driven by reusable patterns

Engineering of Sharing Engineering of sharing is the consolidation design of common IT resources. It is driven by holistic workload distribution and performance requirement. It establish the common IT foundation and building blocks to enable the agility and simplicity. The common IT foundation is established based on the standards established from the engineering of reuse in a bottom up approach.

Driven by  workload distribution The engineering of sharing is driven by the enterprise  business workload distribution and performance requirements from the business architecture. Translate the holistic business workload and performance requirement into IT workload and performance requirement. Divide the enterprise geographical distribution into service areas based on the workload distribution. Select the IT service sites to share common IT resources.