This work discusses the problem of selecting methods for valuing the costs and estimating the time of implementing computer systems in cases when system modification is necessary. The methods presented in literature are reviewed and the stages of strategic phase of implementation characterised....

Background: This paper proposes a risk analysis of transport requalification projects in the urban mobility problem caused by a mining disaster related to irregular rock salt extraction in the city of Maceió, Brazil. Methods: The model is composed of three main steps: problem definition, risk...