The second volume in Weinberg's experiential learning series, published on leanpub in 2014, focuses on the art of debriefing — drawing out and crystallizing the learning from an experience after it has occurred. Inventing here refers to inventing the meaning of an experience, not the experience itself.
Debriefing is the critical skill that separates experiential learning from mere experience. People have experiences constantly without learning from them; the facilitator's role is to create the conditions in which patterns become visible, where what happened can be connected to why it happened and what to do differently. Without skilled debriefing, even powerful exercises yield little.
Weinberg's approach to debriefing draws on satir-change-model thinking: the debrief is the moment when participants move from chaos (disorienting experience) toward integration (new understanding). The facilitator must neither rush this process nor leave participants stranded in confusion.
The volume connects to the broader helpful-model-of-consulting — the same skills that make a consultant useful (asking questions that help clients see what they already know, resisting the urge to tell) make a workshop facilitator effective at debriefing.
Note that this volume was published in 2014, two years before Volume 1 (2016), reflecting the nonlinear way the series developed.