--- abstract: 'This paper examines some sources of problem difficulty with the tool of a new type of artificial problems. The sources are: 1) the number of known variables: it has no effects on problem difficulty. 2) the number of unknown variables: problem difficulty will increase when it increases. 3) whether prompting the names are not prompted. 4) the arrangement of variables; problem difficulty will increase if variables are arranged in disorder. 5) the number of operations (processes) to choose; problem difficulty will increase when it increases. 6) the similarity of the operations to choose: problem difficulty will increase when operations are similar. 7) the style of presentation of the former problems; it can change the likelihood that the attributes of problems enter man’s sphere of consciousness; problem difficulty will increase when the attributes of the former problems are unlikely to enter man’s sphere of consciousness.' altloc: [] chapter: ~ commentary: ~ commref: ~ confdates: ~ conference: ~ confloc: ~ contact_email: ~ creators_id: [] creators_name: - family: Shao given: Z. F. honourific: '' lineage: '' - family: Liu given: Y. F. honourific: '' lineage: '' - family: Zhong given: Y. P. honourific: '' lineage: '' date: 1996 date_type: published datestamp: 2007-08-20 department: ~ dir: disk0/00/00/56/57 edit_lock_since: ~ edit_lock_until: ~ edit_lock_user: ~ editors_id: [] editors_name: [] eprint_status: archive eprintid: 5657 fileinfo: /style/images/fileicons/application_pdf.png;/5657/1/Research_on_Problem_Difficulty.pdf full_text_status: public importid: ~ institution: ~ isbn: ~ ispublished: pub issn: ~ item_issues_comment: [] item_issues_count: 0 item_issues_description: [] item_issues_id: [] item_issues_reported_by: [] item_issues_resolved_by: [] item_issues_status: [] item_issues_timestamp: [] item_issues_type: [] keywords: 'problem solving, problem difficulty, artificial problem' lastmod: 2011-03-11 08:56:56 latitude: ~ longitude: ~ metadata_visibility: show note: ~ number: ~ pagerange: 278-281 pubdom: FALSE publication: Psychological Science publisher: ~ refereed: FALSE referencetext: ~ relation_type: [] relation_uri: [] reportno: ~ rev_number: 12 series: ~ source: ~ status_changed: 2007-09-12 17:11:18 subjects: - cog-psy succeeds: ~ suggestions: ~ sword_depositor: ~ sword_slug: ~ thesistype: ~ title: Research on Problem Difficulty (in Chinese) type: journalp userid: 542 volume: 19