A process to derive incrementally a formal specification from an informal specification written in natural-language is presented. This process consists of two major activities, '(design" and "elaborate". Through the design activity, the structure of software modules based on an object oriented model is interactively extracted from the informal English description. Each word such as nouns and verbs in the natural-language sentences is associated with a software concept, e.g. cfa~s, attribute, and method. Especially we concentrate on types of verb patterns occurring in the sentences to increase applicability to dynamic systems. The elaborate activity is one to refine and rewrite the informal specification more precisely based on the derived module design document. We can complete the formal specification through the elaborate -design activity cycle.Each document created in our process is called product. The integration management of the various kinds of the products are supported by a hypertezt system. Furthermore we discuss the whole of software development process in which the design process and the elaborate one are embedded.
We propose a new requirements elicitation method in such a domain of ERP, CRM, and SCM by using specifications of several existing package software. We have analyzed the requirements elicitation processes of experienced analysts in a specific domain, and found that they clarify requirements by referring the specifications of existing packages that seem to be satisfied with customer's needs. This process can be formulated into two sub-processes: 1) package selection, where an analyst compares the customer's needs with functions/non-functions of packages and selects the suitable candidates of packages; and 2) requirements evolution, where he examines the selected packages with his customer and an approved part of specifications of packages are added into their requirements. The proposed method, called PAORE (PAckage Oriented Requirements Elicitation method) is designed based on the analysis. We applied this method to a simple but realistic example of Web-based Sales Supporting System and assessed it.
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