I strongly suggest you do the operations research to map the flow of material, money and information in your client’s business. An accounting package is a model of the client’s financial activities. If it is a map of something else, there will be all sorts of problems because you will be delivering a square peg your client will have to hammer into their round hole. I strongly suggest you do the operations research to map the flow of material, money and information in your client’s business. An accounting package is a model of the client’s financial activities. If it is a map of something else, there will be all sorts of problems because you will be delivering a square peg your client will have to hammer into their round hole.