Summary: Knowledge grows a) from the foundation of prior knowledge and character and b) in response to the demands of problem-centered activity and in proportion to the frequency of access to relevant information. As will be argued below klog-based knowledge-making in formal or informal groups can be expected to result in the most accelerated learning. I have summarized my thinking below and in detail at on a web page linked below.
The personal knowledge-base builder brings her/his knowledge and character to the stage. The activities with which the player is involved and the information that is available interact with the player to produce new knowledge.
A Knowledge-Making (Learning) Theory
If the knowledge-maker has found a problem s/he can't solve but which is within reach [this is referred to as learner (knowledge-maker)readiness or a possessing a sufficient set of foundation concepts and principles] then the rate of problem solution will be in proportion to (a)accessibility and relevance and rapidity of access for pertinent information (during solution formulation/reformulation), (b) and relevance and turnaround time of feedback for each successive solution attempt. (see my illustrated story for details, a big concept table and a 'transformation chart' and another klog entry for prior definitional work).
See work from following individuals for useful thoughts and links:
Matt Mower re how we know a knowledge log 'works'.
Seb Paquet See particularly his story on personal knowledge sharing
John Robb re knowledge log definition.
Jorn Barger re introspective pay-offs of klogging.