{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WEQY5N7XV366G3BHHAUDTU3S62","short_pith_number":"pith:WEQY5N7X","canonical_record":{"source":{"id":"1801.06475","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2018-01-19T16:03:37Z","cross_cats_sorted":[],"title_canon_sha256":"33f3db43af886ce3e19761584c1f4ed9ee2313307a8f7c76feb820a0aaf4cc79","abstract_canon_sha256":"95ba0b79071825a8f30aed7f7c846f89924afb1316d22b581f91a0c6fec8e2af"},"schema_version":"1.0"},"canonical_sha256":"b1218eb7f7aefde36c27382839d372f6b7f2adccfcb3cc7a28f50e6c72f48979","source":{"kind":"arxiv","id":"1801.06475","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.06475","created_at":"2026-05-18T00:25:29Z"},{"alias_kind":"arxiv_version","alias_value":"1801.06475v1","created_at":"2026-05-18T00:25:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.06475","created_at":"2026-05-18T00:25:29Z"},{"alias_kind":"pith_short_12","alias_value":"WEQY5N7XV366","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"WEQY5N7XV366G3BH","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"WEQY5N7X","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WEQY5N7XV366G3BHHAUDTU3S62","target":"record","payload":{"canonical_record":{"source":{"id":"1801.06475","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2018-01-19T16:03:37Z","cross_cats_sorted":[],"title_canon_sha256":"33f3db43af886ce3e19761584c1f4ed9ee2313307a8f7c76feb820a0aaf4cc79","abstract_canon_sha256":"95ba0b79071825a8f30aed7f7c846f89924afb1316d22b581f91a0c6fec8e2af"},"schema_version":"1.0"},"canonical_sha256":"b1218eb7f7aefde36c27382839d372f6b7f2adccfcb3cc7a28f50e6c72f48979","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:25:29.962794Z","signature_b64":"q5jiZN1MulN0TKgguH99QT5cXgF03UZgZdCgK3/9Pl7qB9R8jHQ8utPJ65L90xW/uJm7nPWpw3MkatDR0wECAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b1218eb7f7aefde36c27382839d372f6b7f2adccfcb3cc7a28f50e6c72f48979","last_reissued_at":"2026-05-18T00:25:29.962033Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:25:29.962033Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.06475","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:25:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DWX9nSREgfcdDkk5XntP9K6R6PlTHwwm0Q3gLaKFkR7NuloU8gf9h9jffxsohDmKXyE4BUsv/Gpaba7z0/YQAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:19:21.522817Z"},"content_sha256":"f2c0d42218d8967262555655b535d83554b0dbf81f31dcd4e3243af0a6e9a2a0","schema_version":"1.0","event_id":"sha256:f2c0d42218d8967262555655b535d83554b0dbf81f31dcd4e3243af0a6e9a2a0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WEQY5N7XV366G3BHHAUDTU3S62","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Systematic Review of Productivity Factors in Software Development","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.SE","authors_text":"Melanie Ruhe, Stefan Wagner","submitted_at":"2018-01-19T16:03:37Z","abstract_excerpt":"Analysing and improving productivity has been one of the main goals of software engineering research since its beginnings. A plethora of studies has been conducted on various factors that resulted in several models for analysis and prediction of productivity. However, productivity is still an issue in current software development and not all factors and their relationships are known. This paper reviews the large body of available literature in order to distill a list of the main factors influencing productivity investigated so far. The measure for importance here is the number of articles a fa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.06475","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:25:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1Pu+FkLKN2/aG0KyecTmmw5UfrtMiLQjL6xYC7udmDPNBOtf0M+d+TEswmEslceEqFe8XjIeTiA1eSg0Q1bVAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:19:21.523216Z"},"content_sha256":"bf31f9db01e94dc65ea10ea574ef38057b4ce7c2d2e5b81969c2f2809774f796","schema_version":"1.0","event_id":"sha256:bf31f9db01e94dc65ea10ea574ef38057b4ce7c2d2e5b81969c2f2809774f796"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WEQY5N7XV366G3BHHAUDTU3S62/bundle.json","state_url":"https://pith.science/pith/WEQY5N7XV366G3BHHAUDTU3S62/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WEQY5N7XV366G3BHHAUDTU3S62/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-26T22:19:21Z","links":{"resolver":"https://pith.science/pith/WEQY5N7XV366G3BHHAUDTU3S62","bundle":"https://pith.science/pith/WEQY5N7XV366G3BHHAUDTU3S62/bundle.json","state":"https://pith.science/pith/WEQY5N7XV366G3BHHAUDTU3S62/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WEQY5N7XV366G3BHHAUDTU3S62/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WEQY5N7XV366G3BHHAUDTU3S62","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"95ba0b79071825a8f30aed7f7c846f89924afb1316d22b581f91a0c6fec8e2af","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2018-01-19T16:03:37Z","title_canon_sha256":"33f3db43af886ce3e19761584c1f4ed9ee2313307a8f7c76feb820a0aaf4cc79"},"schema_version":"1.0","source":{"id":"1801.06475","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.06475","created_at":"2026-05-18T00:25:29Z"},{"alias_kind":"arxiv_version","alias_value":"1801.06475v1","created_at":"2026-05-18T00:25:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.06475","created_at":"2026-05-18T00:25:29Z"},{"alias_kind":"pith_short_12","alias_value":"WEQY5N7XV366","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"WEQY5N7XV366G3BH","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"WEQY5N7X","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:bf31f9db01e94dc65ea10ea574ef38057b4ce7c2d2e5b81969c2f2809774f796","target":"graph","created_at":"2026-05-18T00:25:29Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Analysing and improving productivity has been one of the main goals of software engineering research since its beginnings. A plethora of studies has been conducted on various factors that resulted in several models for analysis and prediction of productivity. However, productivity is still an issue in current software development and not all factors and their relationships are known. This paper reviews the large body of available literature in order to distill a list of the main factors influencing productivity investigated so far. The measure for importance here is the number of articles a fa","authors_text":"Melanie Ruhe, Stefan Wagner","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2018-01-19T16:03:37Z","title":"A Systematic Review of Productivity Factors in Software Development"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.06475","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:f2c0d42218d8967262555655b535d83554b0dbf81f31dcd4e3243af0a6e9a2a0","target":"record","created_at":"2026-05-18T00:25:29Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"95ba0b79071825a8f30aed7f7c846f89924afb1316d22b581f91a0c6fec8e2af","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2018-01-19T16:03:37Z","title_canon_sha256":"33f3db43af886ce3e19761584c1f4ed9ee2313307a8f7c76feb820a0aaf4cc79"},"schema_version":"1.0","source":{"id":"1801.06475","kind":"arxiv","version":1}},"canonical_sha256":"b1218eb7f7aefde36c27382839d372f6b7f2adccfcb3cc7a28f50e6c72f48979","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b1218eb7f7aefde36c27382839d372f6b7f2adccfcb3cc7a28f50e6c72f48979","first_computed_at":"2026-05-18T00:25:29.962033Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:25:29.962033Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q5jiZN1MulN0TKgguH99QT5cXgF03UZgZdCgK3/9Pl7qB9R8jHQ8utPJ65L90xW/uJm7nPWpw3MkatDR0wECAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:25:29.962794Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.06475","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f2c0d42218d8967262555655b535d83554b0dbf81f31dcd4e3243af0a6e9a2a0","sha256:bf31f9db01e94dc65ea10ea574ef38057b4ce7c2d2e5b81969c2f2809774f796"],"state_sha256":"05bfd9e51f87ac123fa24c3e36c0add58a46d26cc6bef4c29dc5bcfbee3739cc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8+t9bp4nrBsyxfXNSoSp3d0ZOPklNOvSCBSmsCXZ/CkT2/F62BA1odSK299F3SAfLi/EEXRHZmTzDhjcg/A3Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:19:21.525457Z","bundle_sha256":"2a570e288fe716ee915fe568dea4017e34b17467ab20c58bff04a6a7c1c29c78"}}