Software Release Planning: An Evolutionary and Iterative Approach

Abstract To achieve higher flexibility and to better satisfy actual customer requirements, there is an increasing tendency to develop and deliver software in an incremental fashion. In adopting this process, requirements are delivered in releases and so a decision has to be made on which requirements should be delivered in which release. Three main considerations that need to be taken account of are the technical precedences inherent in the requirements, the typically conflicting priorities as determined by the representative stakeholders, as well as the balance between required and available effort. The technical precedence constraints relate to situations where one requirement cannot be implemented until another is completed or where one requirement is implemented in the same increment as another one. Stakeholder preferences may be based on the perceived value or urgency of delivered requirements to the different stakeholders involved. The technical priorities and individual stakeholder priorities may be in conflict and difficult to reconcile. This paper provides (i) a method for optimally allocating requirements to increments; (ii) a means of assessing and optimizing the degree to which the ordering conflicts with stakeholder priorities within technical precedence constraints; (iii) a means of balancing required and available resources for all increments; and (iv) an overall method called EVOLVE aimed at the continuous planning of incremental software development. The optimization method used is iterative and essentially based on a genetic algorithm. A set of the most promising candidate solutions is generated to support the final decision. The paper evaluates the proposed approach using a sample project.

Naturalising the Highlands: geographies of mountain fieldwork in late-Victorian Scotland

Through a detailed examination of two late-Victorian field clubs dedicated to the exploration of alpine botany in the Scottish Highlands, this paper contributes to work on the historical geographies of civic science. By focusing on the scientific and social character of mountain fieldwork it analyses the reciprocal relations between the spaces, practices and science of Highland botanising and wider concerns with sociability, character and civic virtue. In so doing it investigates the transposition of a variety of discursive resources from evolutionism to tourism into the language and practices of botanical science. This focus enables the paper to complicate more general accounts of natural history in the Victorian period and to consider a number of methodological issues relevant to reconstructing the historical geographies of science.