1. specify barriers, equipment, tools, spares including
human factor (HF) considerations;
2a. choose to buy barrier:
a. make inventory and selection of suppliers;
b. select and order equipment, materials;
c. receive, check and store orders and purchases;
d. check requisition and issue;
2b. or fabricate barrier:
a. plan resources for fabrication;
b. fabricate, including HF;
3. install and adjust, including HF;
4. register performance, evaluate and learn.