$-$ Do a research of recommendation systems for software engineering. Be able to name

at least five such systems. Here is the reference for this point $$M$.$ Robillard, R$.$

Walker and T$.$ Zimmermann, "Recommendation Systems for Software

Engineering," in IEEE Software, vol. $27,$ no$.4,$ pp$.80-86,$ July$-$Aug. $2010,$ doi:

$10\mathrm{.}1109/$MS$\mathrm{.}2009\mathrm{.}161.$