DoD systems are categorized in two ways: mission assurance category (MAC) and classification level (CL).
There are 3 MAC levels: I, II, and III.
Refer to DoDI 8500.2 for more details, but in general terms:
MAC I systems cannot ever go down - the mission of the organization fails, the war is lost, people die - bad, bad stuff happens if the system goes down without another system coming on line immediately to take over for it
MAC II systems cannot be down for very long. When they are down, mission capability is degraded until the capability is restored. A great many DoD systems fall in this category
MAC III systems need to be back up and running as soon as reasonable. They are not critical or vital to operations but do impact day to day operations. Public facing web sites, continuing learning sites, stuff like that are typical MAC III systems
There are 3 CL levels: classified, sensitive, public
Classified includes system handling information with Confidential, Secret, and Top Secret classifications
Sensitive includes systems handling unclassified information that is nevertheless sensitive such as Personal information (PII) like soldiers social security numbers, annual personnel evaluations, etc, as well as information that is FOUO or CUI (controlled unclassified information.
Public includes systems handling information open to the public such as public DoD web sites.
Three confidentiality levels are used in DIACAP: Public Sensitive Classified
Classified, Sensitive and Public
classified,sensitive,public.
(1) Classified (2) Sensitive (3) Public
Classified, Sensitive, and Public
DIACAP replaced DITSCAP as the process for certification and accreditation of DoD information systems. DIACAP supersedes DITSCAP.
DIACAP is DoD Instruction 8510.01. In that respect, SOME DoD instructions fall under DIACAP, but most DoD instructions have nothing to do with DIACAP.
Paragraph E2.1.8 of DoDI 8500.2 states: The Department of Defense has three defined confidentiality levels: classified, sensitive, and public. Since DIACAP is based off of the requirements of DoDI 8500.2, those would be the 3 levels used for that process.
DIACAP Knowledge Service.
DIACAP is established by DoD Instruction 8510.01.
According to DODI 8500.2, the "DIACAP team members" are defined as: E2.25. DIACAP Team. Comprised of the individuals responsible for implementing the DIACAP for a specific DoD IS. At a minimum the DIACAP Team includes the DAA, the CA, the DoD IS program manager (PM) or system manager (SM), the DoD IS IA manager (IAM), IA officer (IAO), and a user representative (UR) or their representatives.
No - DIACAP (DoDI 8510.01) superseded DITSCAP (DoDI 5200.40) in 2006.