$1\mathrm{.}18.$ What is information systems analysis and design?$1\mathrm{.}20.$ List and explain the different phases of the SDLC$\mathrm{.}1\mathrm{.}21.$ List and explain some of the problems with the traditional waterfall SDLC$\mathrm{.}1\mathrm{.}22.$ Explain what is meant by agile methodologies$\mathrm{.}1\mathrm{.}24.$ What is SCRUM?$1\mathrm{.}26.$ When would you use agile methodologies versus an engineering$-$based approach to development?