Leaked internal documents have laid bare a staggeringly sophisticated level of administration imposed by ISIS (Daesh) in a bid to turn its self-declared caliphate into a legitimate state.
The militants have created departments to administer over the health, education and the treasury sectors, while it also holds 15-day annual refresher courses for its veteran soldiers.
The majority of the revelations come in a 24-page memo, shown to The Guardian, which was published in the months after the group announced its caliphate in mid-2014.
Other details emerge in hundreds of documents translated by Aymenn al-Tamimi, a 23-year-old researcher in Cardiff.
The primary document - named Principles in the Administration of the Islamic State - was written as a base text to train groups of civil servants.
It says: 'The state requires an Islamic system of life, a Qur’anic constitution and a system to implement it.
'There must not be suppression of the role of qualifications, skills of expertise and the training of the current generation on administering the state.'
This includes how to run the health system, which now has its own department and is controlled by installing ISIS administrators in senior positions at hospitals.
Perhaps most interestingly, the blueprint shows ISIS always intended to train child soldiers in warfare.
The documents reveal child soldiers will be trained to use weaponry, with those children who excel selected for security assignments, such as manning checkpoints and joining patrols.
Propaganda footage released of such training camps show young boys being made to run, climb and crawl through a treacherous assault courses.
Armed with rocket launchers and AK47s, the so-called 'cubs of the caliphate' are also forced to pose under the notorious black flag used by ISIS.
Experts previously spoken to by MailOnline suggest that by hijacking their education from an early age, ISIS can mould these children into loyal fanatics who are willing to die defending the state.
The leaked document also shows there are two other types of military camps - this includes 15-day refresher courses for its battlefield veterans, and introduction camps in which new fighters are trained in warfare as well as Islamic teachings.
Internal ISIS memos reveal children showing promise at the training camps are selected for low-level security assignments.
Other documents show it has a department dealing with state assets, such as its oil production and the looting and trading of antiquities.
ISIS is thought to control about 10 oil fields in Iraq and Syria, from where it sells crude oil at the well head.
This is then smuggled through the region by a black market network of traders and is consumed in Turkey, Iran and Jordan.
Remarkably, the documents referenced by The Guardian suggest it made only $8.4million from the Deir ez-Zor oilfields in January. If correct, it would indicate the group earns substantially less than the estimated one-million-per-day previously reported.
ISIS also controls at least eight power plants in Syria. Remarkably, gas supplies 90 percent of the power grid used in both ISIS and regime-controlled territory.
Other rackets include control over the production of wheat, the looting of historical antiquities and extortion.
ISIS's emphasis on its economy has previously been well established, by the documents provide a fascinating glimpse into civil society within the territory it administers.
In last month's Global Terrorism Index, Dr Christina Schori Liang from the Geneva Centre for Security Policy, offered compelling detail on exactly how ISIS is funding its wholesale slaughter.
She described the 10 oilfields through Iraq and Syria controlled by the militants as its 'black gold'.
'Oil wealth serves several purposes: it provides energy needs for the estimated 10 million civilians living in ISIS controlled territory and it helps fuel the war machine.
'More importantly, oil is used as a leveraging device to control its enemies. Many opposition forces are dependent on ISIS for diesel.'
She added: 'In territories now under [ISIS] control, there is a 10 per cent income tax, 10-15 percent tax on business revenues, and a 2 percent value added tax on everyday purchases.
'There are road taxes and custom taxes for vehicles crossing [ISIS] held territory and taxes for smuggling drugs and weapons.'
The militants also require citizens to pay a 'departure tax' of $950 for anyone wishing to leave their territory.
'Fearing that many will leave, [ISIS] requires that civilians sign over car titles and family homes in order to just to leave its territory for two weeks,' she added. 'Christians are forced to pay jiza, a religious levy or "protection tax," unless they convert to Islam.'
By Corey Charlton
