1. A computer program product for enabling a computer to provide graphical authoring and editing of a diagnostic fault flow mark-up language sequence, wherein the diagnostic fault flow mark-up language sequence comprises at least a portion of an interactive electronic technical manual test program sequence for testing at least a portion of at least one system of an aircraft, comprising: software instructions for enabling the computer to perform predetermined operations; and a computer readable medium bearing the software instructions; the predetermined operations including the steps of: displaying a plurality of user-selectable graphical symbols, wherein each graphical symbol is representative of a mark-up language component that includes a unit of functionality in a diagnostic fault flow, wherein each mark-up language component comprises an attribute module and mark-up language code; selecting a first mark-up language component in response to user input; displaying a first graphical representation of the first selected mark-up language component; selecting a second mark-up language component in response to user input; displaying a second graphical representation of the second selected mark-up language component; connecting the first graphical representation to the second graphical representation by one or more lines on a graphical interface in response to user input; configuring the code of the first mark-up language component for use in the mark-up language sequence by initializing the attributes and properties of the first mark-up language component responsive to the presence of the second mark-up language component; configuring the code of the second mark-up language component for use in the mark-up language sequence by initializing the attributes and properties of the second mark-up language component responsive to the presence of the first component; displaying the attributes and properties of the first selected mark-up language component on a graphic interface in response to user input; editing the attributes and properties of the first selected mark-up language component in response to user input; displaying the attributes and properties of the second selected mark-up language component on a graphic interface in response to user input; editing the attributes and properties of the second selected mark-up language component in response to user input; displaying mark-up language code associated with each selected mark-up language component on a graphic interface in response to user input, wherein the mark-up language code comprises at least a portion of an interactive electronic technical manual test program sequence for testing at least a portion of a system of an aircraft; and outputting the diagnostic fault flow mark-up language sequence to an interactive electronic technical manual such that the diagnostic fault flow mark-up language sequence can be executed on the interactive electronic technical manual to assist with a diagnostic evaluation of the aircraft, wherein the computer provides graphical authoring and editing capability of at least a portion of an interactive electronic technical manual test program sequence for testing at least a portion of at least one system of the aircraft.