There are two basic steps to good permaculture design. The first deals with laws and principles, while the second is more closely associated with practical techniques.
The principles are inherent in any permaculture design, in any climate, and at any scale. They are, briefly:
Relative location: every element is placed in relationship to another so that they assist each other
Each element performs many functions.
Each important function is supported by many elements.
Efficient energy planning for house and settlement.
Emphasis on the use of biological resources over fossil fuel resources.
Energy recycling on site.
Using and accelerating natural plant succession to establish favourable sites and soils.
Polyculture and diversity of beneficial species for a productive, interactive system.
Of all the principles of software engineering which has fallen by the wayside in the modern “move fast and break things” mentality of assholes modern software developers, reliability is perhaps the most neglected, along with its cousin, robustness. Almost all software that users encounter in $CURRENTYEAR is straight-up broken, and often badly.
The garden is as central to the concept of an Islamic home as the hearth is to the European home. It is interesting, then, that the hearth-fire in old traditions has a similar association with the life of the inhabitants of the house.
Commonly, the fire of the hearth was not allowed to go out. It was carefully covered with ashes each night at curfew so that a few selected embers would survive until morning. (In fact, the word "curfew" originated from the French word for cover-the-fire—couvre-feu.) Raglan comments that "the alarm and horror felt if the hearth-fire went out are out of all proportion to the inconvenience caused" by the need to relight it.