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| Year period | Research papers (traditional projects) | Review/progress discussion |
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| 2007–13 | Zou et al. [92]; Tumi et al. [11]; Olawale and Sun [109]; Motaleb and Kishk [73]; Oshodi Olalekan and Rimaka [80]; Pai and Bharath [84]; Kamanga and Steyn [86]; Akogbe et al. [105]; Alinaitwe et al. [106] | Tumi et al. [11] in 2009 have included almost 18 employer-related delay factors such as improper planning, lack of effective communication, design errors, date of notice to proceed, and project management issues. However, for the targeted research papers between 2007 and 2013, employer-related delay factors have been either not considered or considered partially with regard to managerial aspects, social aspects, technical aspects, financial aspects, contractual aspects, and environmental aspects. |
| 2014–16 | Muhwezi et al. [74]; Rahimipour and Shahhosseini [77]; Tawil et al. [79]; Amoatey et al. [81]; Shehu et al. [83]; Gajare and Attarde [85]; Bekr [87]; Khan [76]; Al-Emad and Nagapan [88]; Dontul et al. [94]; Suksai et al. [89]; Van et al. [91]; Kim et al. [102]; Gunduz et al. [111]; Ballesteros-Pérez et al. [114]; Emam et al. [72]; Samarah and Bekr [14]; Shah [75]; Upadhyay et al. [78]; Rauzana [82]; Addo [93]; Senouci et al. [95]; Samarghandi et al. [96]; Assbeihat [97]; Megha and Rajiv [98]; Khattri et al. [100]; Alhajri and Alshibani [101] | It is still a fact that the employer-caused delay aspects have been either not addressed or partially addressed. For instance, Muhwezi et al. [74] have considered 15 employer-caused delay factors such as corruption tendencies, change orders, delay in payments, and delay in approving design documents. |
| 2017–18 | Al-Hazim et al. [71]; Islam and Trigunarsyah [90]; Alamri and Amoudi [99]; Sohu et al. [103]; Famiyeh et al. [107]; Maués et al. [113]; Tafazzoli and Shrestha [115]; Wang et al. [116]; Al Hadithi [104]; Damoah and Kumi [108]; Zidane and Andersen [110]; Zidane and Andersen [112] | It is still a fact that the employer-caused delay aspects have been either not addressed or partially addressed. For instance, Wang et al. [116] have reviewed the construction delay in the Chinese building projects in which 14 employer-caused delay factors have not been considered, such as employer interference, employer variations/changes in scope, and defective materials provided by the employer. |
| 2019–21 | Abbasi et al. [117]; Arantes and Ferreira [118]; Muneeswaran et al. [119]; Bajjou and Chafi [120] | The number of employer delay factors (the targeted research papers between 2019 and 2021) are 10, 9, 11, and 5. Abbasi et al. [117] have managed to address the financial delay factors aspects in total. They managed to address the delays in financial factors such as “problems in financing and providing sufficient and stable cash flow during the construction phase and financial problems and delays in payments for completed work.” |
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