Warnier/Orr

LDC Whole Part 1 Part 2 Part 3

The hierarchy operation breaks things into parts:
The whole consisists of Part 1 and Part 2 and Part 3.

Warnier/Orr

LDC Job Task A Task B Task C

Sequence orders things:
The whole consisisis of first Task A, followed by Task B, then Task C.

Warnier/Orr

LDC Color | Red | Green | Blue.

Selection allows choices:
Color consisists of either Red or Green or Blue.

Warnier/Orr

LDC Action Code | Valid | NOT Valid

Complement is the logical NOT:
The Action Code is either Valid or NOT Valid.

Warnier/Orr

LDC Job Task A (3) Task B (3,T) Task C

Repetition provides looping:
Job consists of first doing Task A 3 times, followed by 3 to T repetitions of Task B then doing Task C 1 time.

Warnier/Orr

LDC Job Task A Task B

Concurrency allows things to happen at the same time:
Job consists of Task A and Task B at the same time.

Warnier/Orr

LDC Task Begin ... ... ... End ... ...

The Begin block performs inicialization and the End block performs termination.

Warnier/Orr

LDC Process item Step 1 Process item Structure B

A recursion process contains itself as a sub-process.