{"id":"https://openalex.org/W2019138463","doi":"https://doi.org/10.1016/s0164-1212(00)00031-5","title":"Software evolution: code delta and code churn","display_name":"Software evolution: code delta and code churn","publication_year":2000,"publication_date":"2000-10-01","ids":{"openalex":"https://openalex.org/W2019138463","doi":"https://doi.org/10.1016/s0164-1212(00)00031-5","mag":"2019138463"},"language":"en","primary_location":{"id":"doi:10.1016/s0164-1212(00)00031-5","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0164-1212(00)00031-5","pdf_url":null,"source":{"id":"https://openalex.org/S37879656","display_name":"Journal of Systems and Software","issn_l":"0164-1212","issn":["0164-1212","1873-1228"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Systems and Software","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5104038153","display_name":"Gregory A. Hall","orcid":null},"institutions":[{"id":"https://openalex.org/I13511017","display_name":"Texas State University","ror":"https://ror.org/05h9q1g27","country_code":"US","type":"education","lineage":["https://openalex.org/I13511017"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Gregory A. Hall","raw_affiliation_strings":["Department of Computer Science, Southwest Texas State University, 601 University Drive, San Marcos, TX 78666-4616, USA"],"affiliations":[{"raw_affiliation_string":"Department of Computer Science, Southwest Texas State University, 601 University Drive, San Marcos, TX 78666-4616, USA","institution_ids":["https://openalex.org/I13511017"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5109148344","display_name":"John C. Munson","orcid":null},"institutions":[{"id":"https://openalex.org/I155093810","display_name":"University of Idaho","ror":"https://ror.org/03hbp5t65","country_code":"US","type":"education","lineage":["https://openalex.org/I155093810"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"John C. Munson","raw_affiliation_strings":["Department of Computer Science, University of Idaho, Moscow, ID 83843-1010, USA"],"affiliations":[{"raw_affiliation_string":"Department of Computer Science, University of Idaho, Moscow, ID 83843-1010, USA","institution_ids":["https://openalex.org/I155093810"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5104038153"],"corresponding_institution_ids":["https://openalex.org/I13511017"],"apc_list":{"value":3560,"currency":"USD","value_usd":3560},"apc_paid":null,"fwci":0.9241,"has_fulltext":false,"cited_by_count":52,"citation_normalized_percentile":{"value":0.85989193,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":98},"biblio":{"volume":"54","issue":"2","first_page":"111","last_page":"118"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10260","display_name":"Software Engineering Research","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1710","display_name":"Information Systems"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10260","display_name":"Software Engineering Research","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1710","display_name":"Information Systems"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10639","display_name":"Advanced Software Engineering Methodologies","score":0.995199978351593,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12423","display_name":"Software Reliability and Analysis Research","score":0.9943000078201294,"subfield":{"id":"https://openalex.org/subfields/1712","display_name":"Software"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/code","display_name":"Code (set theory)","score":0.6962078809738159},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6721541285514832},{"id":"https://openalex.org/keywords/software","display_name":"Software","score":0.6066022515296936},{"id":"https://openalex.org/keywords/software-system","display_name":"Software system","score":0.5645130276679993},{"id":"https://openalex.org/keywords/source-lines-of-code","display_name":"Source lines of code","score":0.48944583535194397},{"id":"https://openalex.org/keywords/software-evolution","display_name":"Software evolution","score":0.47219881415367126},{"id":"https://openalex.org/keywords/software-development","display_name":"Software development","score":0.45828691124916077},{"id":"https://openalex.org/keywords/software-construction","display_name":"Software construction","score":0.4251802861690521},{"id":"https://openalex.org/keywords/software-engineering","display_name":"Software engineering","score":0.382618248462677},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.35725104808807373}],"concepts":[{"id":"https://openalex.org/C2776760102","wikidata":"https://www.wikidata.org/wiki/Q5139990","display_name":"Code (set theory)","level":3,"score":0.6962078809738159},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6721541285514832},{"id":"https://openalex.org/C2777904410","wikidata":"https://www.wikidata.org/wiki/Q7397","display_name":"Software","level":2,"score":0.6066022515296936},{"id":"https://openalex.org/C149091818","wikidata":"https://www.wikidata.org/wiki/Q2429814","display_name":"Software system","level":3,"score":0.5645130276679993},{"id":"https://openalex.org/C199519371","wikidata":"https://www.wikidata.org/wiki/Q942695","display_name":"Source lines of code","level":3,"score":0.48944583535194397},{"id":"https://openalex.org/C202105479","wikidata":"https://www.wikidata.org/wiki/Q265013","display_name":"Software evolution","level":5,"score":0.47219881415367126},{"id":"https://openalex.org/C529173508","wikidata":"https://www.wikidata.org/wiki/Q638608","display_name":"Software development","level":3,"score":0.45828691124916077},{"id":"https://openalex.org/C186846655","wikidata":"https://www.wikidata.org/wiki/Q3398377","display_name":"Software construction","level":4,"score":0.4251802861690521},{"id":"https://openalex.org/C115903868","wikidata":"https://www.wikidata.org/wiki/Q80993","display_name":"Software engineering","level":1,"score":0.382618248462677},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.35725104808807373},{"id":"https://openalex.org/C177264268","wikidata":"https://www.wikidata.org/wiki/Q1514741","display_name":"Set (abstract data type)","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/s0164-1212(00)00031-5","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0164-1212(00)00031-5","pdf_url":null,"source":{"id":"https://openalex.org/S37879656","display_name":"Journal of Systems and Software","issn_l":"0164-1212","issn":["0164-1212","1873-1228"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Systems and Software","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Industry, innovation and infrastructure","id":"https://metadata.un.org/sdg/9","score":0.5400000214576721}],"awards":[],"funders":[{"id":"https://openalex.org/F4320306076","display_name":"National Science Foundation","ror":"https://ror.org/021nxhr62"},{"id":"https://openalex.org/F4320310830","display_name":"Texas State University","ror":"https://ror.org/009ey6w22"},{"id":"https://openalex.org/F4320332375","display_name":"Jet Propulsion Laboratory","ror":"https://ror.org/027k65916"}],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":10,"referenced_works":["https://openalex.org/W1505648523","https://openalex.org/W1591311008","https://openalex.org/W1964962870","https://openalex.org/W1986845283","https://openalex.org/W1995613177","https://openalex.org/W1997361857","https://openalex.org/W2080372843","https://openalex.org/W2123127356","https://openalex.org/W2170555940","https://openalex.org/W6647196439"],"related_works":["https://openalex.org/W2064336064","https://openalex.org/W2185084576","https://openalex.org/W2380017313","https://openalex.org/W1576738836","https://openalex.org/W2287452355","https://openalex.org/W2166356874","https://openalex.org/W2371269538","https://openalex.org/W2363993616","https://openalex.org/W4382053383","https://openalex.org/W2170878331"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":2},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":3},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":3},{"year":2018,"cited_by_count":1},{"year":2017,"cited_by_count":5},{"year":2015,"cited_by_count":3},{"year":2014,"cited_by_count":2},{"year":2013,"cited_by_count":2},{"year":2012,"cited_by_count":3}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}