A Development Episode may intertwine with other activities demanding the attention of the Work Group. Further, some concepts may require quite contemplation to absorb or may involve sufficient detail that they cannot be recalled without aid.
Therefore: Maintain a series of page-printable technical memoranda addressing subjects not easily expressed in the program under development.
Focus each memo on a single subject and keep the text short and to the point. Carefully selected and well written memos can easily substitute for traditional comprehensive design documentation. The latter rarely shines except in isolated spots. Elevate those spots to technical memos and forget about the rest.