The report contains five papers dealing with some problems of a general classification scheme covering the whole field of knowledge which were presented at a conference held in London, June 1963. Topics covered included retrieval schemes, classification problems, inadequacies of existing classification schemes and the proposal of the Classification Research Group (CRG) for a new general classification. Thirteen papers representing the research efforts of the CRG during the years 1960-1968 under a grant to the Library Association form a record of progress under the grant. Various categories of terms and relationships of subjects, entity sequence, and notation problems are explored. Appendices provide tables of operators, provisional categories of attributes and schedules of entities. (AB)