1 Topsoil is also sold in bags, at $2-$5 a bag. 2  It takes roughly 18-20 bags to make a cubic yard, or $36-$100. 3  That works out to about $180-$500 for five yards; typically, bags of topsoil are only used for extremely small areas.
The system metaphor is one of the trickier parts of XP (Extreme Programming). This presentation is from a tutorial taught at several of the early agile conferences, and includes material supporting the exercises. CC-BY-SA. Published in: Technology, Entertainment & Humor.
At its best, the metaphor is a simple evocative description of how the program works, such as âthis program works like a hive of bees, going out for pollen and bringing it back to the hiveâ as a description for an agent-based information retrieval system. Sometimes a sufficiently poetic metaphor does not arise.