Information system represent important shares in managing running all activity one among others is sale information system and purchasing of present goods used in co-operation DEWA INDRA still have insuffiency more and not yet used information system base on computer. In fulfilling requirement of co-operation, specially to handle the problem of sale and purchasing of good and making report of not yet walked maximally as expected. So that co-operation require better system by using information system being based computer. Methodologies of system the used is to Methodologies of SLDC (System Develovment Life Cycle) and Waterfall. Sytem development life cycle ana Waterfall can mean to compile a new system to replace system old one as a whole or improve repair system there have. Especial step of cyle live development of system (System Develovmat Life Cycle) can consist of some phase that si : Planing of system, Analyst System, Design system, Selection System, Implemention of System And treatment of System Applied of sale information system application and purchasing of goods and making of new report at co-operation DEWA INDRA hence will water down and quicken data prcessing of sale and purchasing of good and making report minimalisasi or event eliminate mistake, so that co-operation target and medium can reach maximally and well guaranted from its security facet because have owned rights acces to using the system.

Information system represent important shares in managing running all activity one among others is sale information system and purchasing of present goods used in co-operation DEWA INDRA still have insuffiency more and not yet used information system base on computer. In fulfilling requirement of co-operation, specially to handle the problem of sale and purchasing of good and making report of not yet walked maximally as expected. So that co-operation require better system by using information system being based computer. Methodologies of system the used is to Methodologies of SLDC (System Develovment Life Cycle) and Waterfall. Sytem development life cycle ana Waterfall can mean to compile a new system to replace system old one as a whole or improve repair system there have. Especial step of cyle live development of system (System Develovmat Life Cycle) can consist of some phase that si : Planing of system, Analyst System, Design system, Selection System, Implemention of System And treatment of System Applied of sale information system application and purchasing of goods and making of new report at co-operation DEWA INDRA hence will water down and quicken data prcessing of sale and purchasing of good and making report minimalisasi or event eliminate mistake, so that co-operation target and medium can reach maximally and well guaranted from its security facet because have owned rights acces to using the system.

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