Paper and pen (of two colors).
Draw a circle with text to the right, bottom, etc, connect to other items and sketches with arrows. In top left corner there is a type-box with "task|iss|pm|adm" text or combination of these — that quickly describes contents of the page. In progress, Completed, Rejected items are marked with ..., V, X. Once all is completed/rejected, big (V) mark near type-box is drawn, (W) for "even tested". If related group is completed, draw bounding shape and big (V) in it. Use colors for better visual cues.
Draw shortened operative plan (with ...) on separate temporary page. Dispose it once complete.
Put all papers into "punched pocket"[1] in you-see-latest order.
I tried many tools and formats, but these are either unflexible or slow to create, this tradeoff was never beaten. At first glance, one may note that there is no search or redraw capabilities, but these are not really necessary, if you follow simple rules.
Never reuse page for something completely unrelated or temporary. Use only one side of paper. Disallow your colleagues to draw anything on it, always have blank pages for them. Redraw papers that were wasted like above. Every [edit]discussed task should have a circle and text. Once punched pocket is full, archive bottom half of it into hard folder.
Listing these pages makes me instantly remember the entire situation/discussion. It never happens with post-created electronic records.
[1] https://en.m.wikipedia.org/wiki/Punched_pocket