Information retrieval, assessment and evaluation, organization, analysis, presentation, security, and collaboration are essential to PKM. Wright's model involves four interrelated domains: analytical, information, social, and learning. The analytical domain involves competencies such as interpretation, envisioning, application, creation, and contextualization. The information dimension comprises the sourcing, assessment, organization, aggregation, and communication of information. The social dimension involves finding and collaborating with people, the development of both close networks and extended networks, and dialogue. The learning dimension entails expanding pattern recognition and sensemaking capabilities, reflection, development of new knowledge, improvement of skills, and extension to others. This model stresses the importance of both bonding and bridging networks. In Nonaka and Takeuchi's
SECI model of knowledge dimensions (see under
knowledge management), knowledge can be tacit or explicit, with the interaction of the two resulting in new knowledge. Smedley has developed a PKM model based on Nonaka and colleagues' model in which an expert provides direction while a
community of practice provides support for personal knowledge creation. Trust is central to knowledge sharing in this model. Nonaka has returned to his earlier work in an attempt to further develop his ideas about knowledge creation Personal knowledge management can also be viewed along two main dimensions, personal
knowledge and personal
management. Zhang has developed a model of PKM in relation to organizational knowledge management (OKM) that considers two axes of knowledge properties and management perspectives, either organizational or personal. These aspects of organizational and personal knowledge are interconnected through the OAPI process (organizationalize, aggregate, personalize, and individualize), whereby organizational knowledge is personalized and individualized, and personal knowledge is aggregated and operationalized as organizational knowledge. A major edited collection examining PKM from individual, organizational, and social perspectives is the 2011 volume by Pauleen and Gorman. Cheong and Tsui (2011) reviewed a decade of PKM model development and identified a clear evolution from early competency-based frameworks toward more integrated, outcome-oriented approaches that link personal skills to collaborative work. ==Criticism==