The posts at these two OSS pages may be an illustration of how the students documented their work progress and assignments last semester.
But each of you will find your own way and style.
DM2006 Narratives for Interaction
https://oss.adm.ntu.edu.sg/18s2-dm2006-tut-g01/
DM2007 Interactive II
https://oss.adm.ntu.edu.sg/18s2-dm2007-tut-g01/