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Table 4. RII Ranking of Technological Factors. This result agrees with the findings of Hinze, who argue that the delays and costs associated with Rework in construction have profound impact on productivity [12]. nspection delay by the engineer is ranked the sixth. This constraint is very significant in terms of its influence on the abor productivity of Libya. Moreover, factor inspection by the engineer is ranked the sixth within a group with RII of 75.3%. The thirteenth of the overall ranks of productivity factors surveyed. However, Quality of drawings and Frequent change to orders during execution are ranked the seventh and eighth within the group with RI of 67.2% and 62.8%, factors. Sixteenth and nineteenth in terms of the overall elements, respectively.

Table 4 RII Ranking of Technological Factors. This result agrees with the findings of Hinze, who argue that the delays and costs associated with Rework in construction have profound impact on productivity [12]. nspection delay by the engineer is ranked the sixth. This constraint is very significant in terms of its influence on the abor productivity of Libya. Moreover, factor inspection by the engineer is ranked the sixth within a group with RII of 75.3%. The thirteenth of the overall ranks of productivity factors surveyed. However, Quality of drawings and Frequent change to orders during execution are ranked the seventh and eighth within the group with RI of 67.2% and 62.8%, factors. Sixteenth and nineteenth in terms of the overall elements, respectively.

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Table 1. Summary of the various factors affecting labor productivity that was reported in previous studies and references of these studies. Data were collected based on questionnaires and interviews. The present study uses the method for data collecting: (1) Expert interviews. (2) Questionnaire. (3) Literature review. The design viewpoint of the survey was that the questions had to be simple, clear, and understandable for the respondents and able to be precisely understood by the investigator. Factors affecting the productivity of construction labor were identified based on _ previous iterature, with participation, review, and adjustments by ocal experts; a total of 30 elements were recognized. The experts were required to rank the factors affecting construction labor productivity, considering time, cost, and quality using their knowledge and experiences on project constructions Frefer [9, 10].
Table 1. Summary of the various factors affecting labor productivity that was reported in previous studies and references of these studies. Data were collected based on questionnaires and interviews. The present study uses the method for data collecting: (1) Expert interviews. (2) Questionnaire. (3) Literature review. The design viewpoint of the survey was that the questions had to be simple, clear, and understandable for the respondents and able to be precisely understood by the investigator. Factors affecting the productivity of construction labor were identified based on _ previous iterature, with participation, review, and adjustments by ocal experts; a total of 30 elements were recognized. The experts were required to rank the factors affecting construction labor productivity, considering time, cost, and quality using their knowledge and experiences on project constructions Frefer [9, 10].
Figure 1. RII Ranking of human/labor Factors. Perceiving labor skills as the noticeable factor affecting the efficiency of construction operatives in Libya and indicates a shortage of experienced labor, which further suggests a problem with the quality of the labor force employed in the Libyan's construction industry. Physical fatigue of worker with a relative importance index of 65.2% is ranked second among the group surveyed and the eighteenth compared with other factors studied.
Figure 1. RII Ranking of human/labor Factors. Perceiving labor skills as the noticeable factor affecting the efficiency of construction operatives in Libya and indicates a shortage of experienced labor, which further suggests a problem with the quality of the labor force employed in the Libyan's construction industry. Physical fatigue of worker with a relative importance index of 65.2% is ranked second among the group surveyed and the eighteenth compared with other factors studied.
Table 2. RII Ranking of Management.
Table 2. RII Ranking of Management.
Table 3. RI Ranking of human/labor Factors.
Table 3. RI Ranking of human/labor Factors.
The other significant factors which have less effect on productivity are: Incompetent supervisors, Accidents because of poor safety, Unsuitability of storage location, Communication problems between site management and labor, Late-arrival, early quit, & frequent unscheduled breaks, Lack of training offered to operatives, Lack of recognition program, and Unavailability of equipment and suitable tools.
The other significant factors which have less effect on productivity are: Incompetent supervisors, Accidents because of poor safety, Unsuitability of storage location, Communication problems between site management and labor, Late-arrival, early quit, & frequent unscheduled breaks, Lack of training offered to operatives, Lack of recognition program, and Unavailability of equipment and suitable tools.
Figure 2. RII Categories of factors affecting construction labor productivity. 4.5. Overall Ranking of Categories Factors Affecting Construction Labor Productivity
Figure 2. RII Categories of factors affecting construction labor productivity. 4.5. Overall Ranking of Categories Factors Affecting Construction Labor Productivity
Table 5. Overall Relative Importance Indices and Ranks of Productivity Factors Surveyed.
Table 5. Overall Relative Importance Indices and Ranks of Productivity Factors Surveyed.
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