Software Engineering

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2.2 
Software development process
in the development effort where it is constructive to review the evolving product defi-
nition with important stakeholders. Milestones represent a significant achievement in 
the development of a new software product and permit the investors to determine the 
values in proceeding with the next development stage. These software development 
stages, reviews, and audits are described in the following sections.
2.2.1 
Requirements definition stage
During this development stage the project team interacts with all stakeholders to 
gather, analyze, and prioritize a set of needs and expectations concerning the soft-
ware product to be developed. Requirements specifications are prepared to docu-
ment the agreed-to set of product functions, features, and characteristics that shall 
be present when the product is delivered. An initial set of requirements for the post-
development software sustainment (PDSS) processes may be captured within the 
product specification or as one or more related specifications.