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ISL Functional Structure
The diagram shows the functional structure of the ISL. The diagram depicts the basic functions only, which support mainly materiel, supply and maintenance functions of logistics. The ISL is planned to be enlarged in the second phase to support also other logistic functions, e.g. service, movement and transportation, engineering, etc. Basic characteristics of ISL sub-systems will be described in the following text.

MC Catalogue
The Materiel Codification Catalogue (MC Catalogue) is a basic module of the ISL. It is a tool for materiel codification according to the rules of the NATO Codification System (NCS) and for logistics categorization. It allows electronic data interchange with other NATO and non-NATO countries via the NATO Mail Box System (NMBS). The MC Catalogue is the heart of the ISL and serves to all other modules and sub-systems as a source of data about materiel. The MC Catalogue could be operated as a standing alone system or as a module of the ISL.

The main objectives of the MC Catalogue:
• To create a uniform catalogue of materiel for all services of the armed forces
• To provide support for codification of materiel according to the rules of the NC

Logistic Requirements
The Logistic Requirements provide tools for work with organizational structures of the armed forces (commanding, logistic, financial) derived from the strategic doctrine and logistic methods of the armed forces. It contains the database of all organizational parts of the armed forces (formations and units) including their links and sub-ordinations.
By means of this module, materiel norms used in the armed forces are also maintained.
Materiel norms define entitlements and specific needs of the organizational parts and their specific needs for various activities. The Logistic Requirements also ensure connections between the general materiel norms and standards and specific parts and on that basis it makes it possible to calculate the entitlement of each part with respect to specific materiel items.

Materiel Record Keeping
The Materiel Record Keeping (MRK) is the second basic module of the ISL. It is a tool for the management of central materiel record keeping and creates a basis for a uniform supply system. It follows movements and shipments and the stock level of materiel enrolled in the MC Catalogue. It enables transmission of data concerning materiel transactions to an accounting information system (FIS).

The main objectives of the Materiel Record Keeping:
• To create a basis for a uniform supply system
• Central materiel record keeping management
• Transmission of data concerning materiel movements and shipments to accounting
• Supply Management Sub-system

The Supply Management Sub-system (SMS) covers the supply function of logistics that is armed forces materiel assurance. The objective of this area is, within the determined financial and materiel limits, to create optimal materiel conditions for the fulfillment of the armed forces’ tasks. The SMS is composed of two partial sub-systems: the Inventory Management and the Distribution Management.

Inventory Management Sub-system
It supports in particular the planning and procurement of materiel. The Inventory Management Sub-system is composed of the following modules (according to the DoD terminology called
Computer Software Configuration Items – CSCI):

Provisioning – One of the most important activities of military logistics is to provide the armies with materiel and equipment. There is an immense amount of labor associated with assurance of the operability of the equipment with spare parts and in-time supply of ammunition for the individual organizational parts, while minimizing the warehouse inventories which freeze considerable financial and human resources. Therefore, objective needs must be identified. This is done by means of analyzing the present situation by:
Comparing the current inventory level (Materiel Record Keeping) with the norms for the individual organizational parts (Logistic Requirements)

Including expected consumption derived from experience of past consumption (the Materiel Record Keeping) with known past and future activity of the armed forces (the Equipment Maintenance Sub-system)

Taking into account the expected time of delivery
Taking into account the time of usability of materiel (the Materiel Record Keeping – expiration), percentage of reparability of the damaged materiel (the MC Catalogue), etc.

The result consists of an objective evaluation of the future needs of the armed forces. This result is subsequently modified according to the budget resources assigned (taken from the Planning, Programming and Budgeting System – PPBS). After such a modification it is submitted for implementation (the Acquisition and Procurement Directions).

Information concerning the surplus or useless materiel identifies inputs of the Disposal, where it is further processed.

The main objectives of the Provisioning:
• Forecasting the needs of the armed forces and comparing them with resources; offering objective data for decision-making by an item manager
• Providing data needed for the generation of an acquisition and procurement direction
• Signaling the existence of surpluses and suggesting a method of processing

Acquisition and Procurement Directions – The purpose of this module is to support decision-making concerning which materiel will be procured for the armed forces and in what amounts (purchase, manufacture). The main input consists of data created by the Provisioning.

The directions created in the Provisioning with respect to the assurance of the materiel needs of the armed forces, are connected together to form requirements that are approved within the scope of the hierarchical structure of the armed forces and hand over to the acquisition centre. Appropriate contracts are signed with suppliers. These contracts are followed in the Acquisition and Procurement Directions.

The information concerning the individual expected supplies is distributed to the individual local servers (in warehouses equipped with the Receiving) that on this basis implement receipt of materiel from suppliers.

After physical receipt of the supply, data concerning the gradual fulfillment of the contracted supplies are sent from the Receiving to the Acquisition and Procurement Directions at the central server.

The main objectives of the Acquisition and Procurement Directions:
• Creating, approving and checking the acquisition and procurement directions
• Record keeping of the contracts entered into and monitoring of their execution
• Providing the data from the contracts necessary for the receipt of materiel
• Distribution Directions – Their purpose is to create directions for the complementing of the inventory level according to the amount standard applicable to the individual organizational parts of the armed forces.

• Distribution directions are created based on requirements for materiel from the organizational parts of the armed forces (entered at local servers by means of the Distribution Directions), or based on a parametrisable automated calculation done by comparing the current inventory level (the Materiel Record Keeping) with standards for the individual organizational parts (the Logistic Requirements).

• The distribution direction is sent to the local server of the issuing warehouse (central warehouse or armed forces formation) to be implemented.

The main objectives of the Distribution Directions:
• Enabling control of the distribution process in the armed forces

• Creating distribution directions automatically and manually

• Managing materiel requirements

Distribution Management Sub-system

• The Distribution Management Sub-system (DMS) supports in particular supply and materiel management (supplies to armies according to the defined standards, creation of the necessary inventory, supplies of consumer materiel, definition of conditions for materiel storage, materiel handling, sale and disposal of surplus and useless materiel). The DMS is composed of the following modules:

• Movements and Shipments – the basic tool for the implementation of physical movements and shipments within the armed forces.

• Receiving – the basic tool for the implementation the physical movements and shipments from civil organizations to the armed forces and from the armed forces to civil organizations.

• Storage – supports storage of materiel at the place of its location, stocktaking, maintenance of materiel in long-term storage, etc.

• Issuing – supports the activities connected with the collecting of items from locations in warehouses on the basis of directions from other modules.

• Disposal – supports the process of retrieval of items to be disposed of, the approval of the individual recommendations for materiel to be disposed of, and the monitoring of the process of the implementation of physical disposal or sale of the materiel.

Logistic Management Sub-system
The Logistic Management Sub-system (LMS) serves in particular top-level logisticians. It is composed of the following modules:

Control (Performance Indicators) – is designed for the top level of logistics. It serves to evaluate the logistic performance and effectiveness of logistic entities (formations, warehouses, bases) and processes (supply, maintenance, storage, etc.). It defines the objectives, intentions, measurable norms and performance indicators. Based on these, it compares the actual performance with the relevant norms and presents the result to the user.
The Control (Performance Indicators) contains tools that make it possible to combine the performance indicators into groups for evaluation of comprehensive situations. It also makes it possible to perform several types of result analyses in order to support decision-making.

Operation Logistic Support Planning – provides support for the logistic assurance of operations of the armed forces. It provides a comprehensible overview of the existing situation during the entire operation and supports continuous planning of the logistic support. Information concerning the achieved status of logistic assurance and the existing requirements are transmitted between the individual commanding levels of the armed forces by means of logistic reports.

Logistic support planning takes place with a close direct link to the command and control of the operation.

Equipment Maintenance Sub-system

The Equipment Maintenance Sub-system (EMS) is designed to support the activities related to the planning and executing of the equipment maintenance. A substantial part of the EMS is formed by the monitoring of the operation of equipment. The EMS is composed of the following modules:

Standards, Norms and Procedures – create a database containing a source of information necessary for the majority of processes of the two remaining EMS modules. The database contains in particular information concerning specifications of maintenance and constant tables of various codes with corresponding textual descriptions. The module also makes it possible to monitor the operation, maintenance and composition of specific items of equipment. (Specific items of equipment are explicitly defined in the Standards, Norms and Procedures by means of a catalogue number and a record keeping number.)

Maintenance Planning – supports the user in creating long-term and detailed plans of maintenance, in evaluating the use of maintenance resources with respect to their capacities, and in developing working plans for repair facilities.

The module also makes it possible to monitor the actually implemented operation of the specific items of equipment and compare it with the annual plan of operation.

Maintenance Execution and Control – supports monitoring of maintenance (both scheduled and unscheduled) executed both in the armed forces’ repair facilities and in repair facilities outside the armed forces. By means of a link to maintenance, it is possible to keep records concerning the resources consumed (standard hours, spare parts, services purchased). Information so obtained is used to evaluate the norms of resource consumption for individual types of maintenance and for financial definition of costs of the maintenance executed.

The module also makes it possible to record information concerning defects. Such information is then used in the calculation of performance indicators by means of which it is possible to evaluate the reliability of the equipment.