Overall design activities – defining objectives – structure systems – definition outputs – defining inputs;-definition data collections;-choice mathematical model and related programs;-election technical solutions implemented;-listing resource needs; – estimates of economic efficiency;-planning develop the system;-development documentation.
Information system characteristics:
-all system to contain the central ELEM database, where it is stored together interrelated data from internal and external sources;
Information provided by the system is mandatory to be authentic, accurate, and support presentation range from management level to another;
-system to include a variety of mathematical models, technical and economic, e.g.: optimization models, simulation models, models of efficiency;
Designed as a -system human-machine the system must offer the possibility of immediate interaction by the user and system.
-System must provide a high degree of integration as in the following two aspects: internal integration and external integration.
Requirements of information systems – for making systems that meet the required characteristics of systems is necessary to take into account the following requirements: – foundation system design to be made on grounds of economic efficiency, leadership, direct participation in designing the computer system unit; -ensure a high technical level of tailored solutions;-adopt solutions according to available resources and restrictions.
Areas and activities within the systems are:
1.Planificarea technical-economic-activities:-develop annual plan – plan breakdown by quarter Monday and component units;-tracking method to achieve the plan;
Technical 2.Pregatirea-production-activities:-development plan – working out and updating technology files, batch-calculate optimal consume-specific calculation of raw materials;-tracking and analysis plan for introducing technical progress;-management activities SDV-making sites.
3. Programming, scheduling and monitoring of basic-needs calculation made Business-Plan period, production-development programs;-operative production planning, labor-launch;-release material;
4. Supplying with technical material and production cutting: business, technology and material supply, production, sale and stock-control.
5. Work force:-Business-plan development of employment and wages and tuition funds, personnel, accounting, statistics, analysis and reporting. 
6.Financiar accounting: activity-development budget, income and expenditure, accounting, fixed assets, material values, accounting, bookkeeping, salaries, production costs, accounting, bookkeeping, general.
Structure of computer systems is a necessary step because:
-Large number of elements and connections that make the rule a computer system;-simultaneous implementation of all components of information systems in an economic unit appears as a particularly difficult if the system structure does not occur;-priority targets; -limited amount of human and material resources are impossible to block the computer system design.
Structuring demands of information systems at the design stage of a whole: each level-structuring should ensure uniqueness criterion for decomposition of the system;-made structure should allow further up the entire system by aggregating separate modules;-brain structure should not contain interconnections.
Defining computerized outputs – the output of a computer subsystem will understand that all information provided by internal and external recipients, and reports, information notes.
Defining input systems
Def. By entering a computer system means all raw data necessary to obtain information out of the system. Raw data are classified as internal data and external data. In each subsystem computer system is necessary inputs to be conditioned by its output.
Logically, any exit plan is a result of applying one or more operators on a set of input data. Technologically – outward characteristics condition the system characteristics required inputs. 
Setting Database – principal criteria can be grouped based on which data are related to the sphere of knowledge, by activity, stability and role content data processing data process.
1. After sphere of knowledge – the primary data, technical indicators economic with non-operational;-economic indicators with centralized media-synthetic indicators.
2.After field of activity – collection suppliers, collection beneficiaries-collection contracts;-collection products;-collection items;-collection work;-personal collection, collection, payment, collection receipts.
3. After establish data – conventional-constant data collection, data-collection variables.
Classification conventionally-established data collection: data collection, a total of about 50-60% of circulating information of unit process economical standards. The main collection of normative data: production, regulations, technology, regulations, labor regulations;-materials regulations;
4. After processing – the data collection, data-collection transactions, or interim data-collection work;-collection of statistical data, historical data-collection.
Choosing mathematical economic models: mathematical models used in improving economic activity are:
Linear programming-models-economic problems can be solved with is this type models for optimizing the production plan, distribution of production tasks and optimal use of resources;
Programming-models-economic problems can be solved with this type are determining the global minimum / local for a real function.
Dynamic-programming methods – economic problems which can be achieved with these models are achieving sequential analysis of the processes of decision making, problem solving machinery replacement.
Graph Theory-models – economic problems can thus be solved are those related to determining the optimal value of roads, determining maximum flow;
Inventory-management models – economic problems can be achieved with these models for optimizing purchasing activities, manufacturing and sales;
-Simulation models – economic problems can be achieved with these models simulate the evolution of economic phenomena and processes depending on their nature.
Decision-theory models – economic problems are resolved so multidimensional decisions related foundation, basis for decisions in conditions of risk and uncertainty.
-Tune models – economic problems of these models can be made to minimize waiting time concomitant cu minimize the costs of waiting.
