While there are five novels and five Sci-Fi short stories within each series of the Terran Chronicles saga, there are a varying number of Character Journals. The 'Initiation Series' has two journals, the first is called 'Gamin Technology', while the second is 'New Earth'.
Each journal is written from the perspective of one of the characters from within the novels. To find out who wrote each journal, simply read the online previews.
These character journals are very niche market material, and in no way meant to be stand alone short stories. They work in conjunction with the entire saga of novels and short stories alike, adding even further depth to the overall Terran Chronicles Universe.