sourCEs For DAtA on ACtivity DurAtions AnD rEsourCE rEquirEmEnts CAn BE gAthErED From whiCh oF thE Following:
A pAst projECt rECorDs (historiCAl DAtA)
B CommErCiAl tEChniquEs (stAnDArD prACtiCEs, rulEs oF thumB)
C pAst projECt tEAm mEmBErs knowlEDgE (ExpEriEnCE, olDtimErs)
D All oF thE ABovE
E A AnD C only