<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Monitoring labor productivity and how to decrease construction costs are the key issues in the planning process of a construction project. The CONTEC automated system combined with statistical methods assists in predicting the amount of time required to complete construction works according to the specified number of deployed work crews, technological processes, and labor required for certain production in person-hours. This study applies statistical analyses and probability theories for plastering work, which represents a labor-intensive construction process. The goal of the research is to determine the probability of completion of the construction process based on monitoring the mean value of performance. By application of statistical analyses a decrease in the performance standard has been proved compared with the planned values given in the CONTEC database. The decrease in performance, which was also caused by the number of days with unfavorable climatic conditions and demonstrated by performing interval estimates based on the collection of statistical data, was later confirmed by a relative frequency test. The measures taken were in terms of establishing the required number of personnel capacities for complying with the construction schedule.</p>
</abstract>

Monitoring labor productivity and how to decrease construction costs are the key issues in the planning process of a construction project. The CONTEC automated system combined with statistical methods assists in predicting the amount of time required to complete construction works according to the specified number of deployed work crews, technological processes, and labor required for certain production in person-hours. This study applies statistical analyses and probability theories for plastering work, which represents a labor-intensive construction process. The goal of the research is to determine the probability of completion of the construction process based on monitoring the mean value of performance. By application of statistical analyses a decrease in the performance standard has been proved compared with the planned values given in the CONTEC database. The decrease in performance, which was also caused by the number of days with unfavorable climatic conditions and demonstrated by performing interval estimates based on the collection of statistical data, was later confirmed by a relative frequency test. The measures taken were in terms of establishing the required number of personnel capacities for complying with the construction schedule.

Determination of construction process duration based on labor productivity estimation: A case study

Faculty of Civil Engineering Department of Construction L. Podeště 1875

Department of Construction, Faculty of Civil Engineering

Organization, Technology and Management in Construction: an International Journal

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Monitoring labor productivity and how to decrease construction costs are the key issues in the planning process of a construction project. The CONTEC automated...

Floor	No. of plasterers	Overall performance plan m²/sm	Overall performance plan m²/month
1	8	87.6	1,752
2	8	87.6	1,752
3	–	–	–
4	–	–	–
5	–	–	–
6	–	–	–
7	–	–	–
ς	16	175.2	3,504

Worker no.	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
Performance/shift	12	11	10	12	11	13	12	11	10	12	11	10	13	10	12	11
Worker no.	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32
Performance/shift	12	11	11	12	11	13	12	11	12	12	11	12	13	12	10	12

Ordered		Series (i)		(í−1)/n	í/n	F(x)	D pro	D pro	D

Values x							i/n	(í−1)/n
10		1		0	0.063	0.036	0.027	0.036	0.036
10		2		0.063	0.125	0.036	0.089	−0.027	0.089
11	9	0.5	0.563	0.274	0.289			−0.226	0.289
12	10	0.563	0.625	0.726	−0.101			0.163	0.163
12	11	0.625	0.688	0.726	−0.038			0.101	0.101
12	12	0.688	0.75	0.726	0.024			0.038	0.038
12	13	0.75	0.813	0.726	0.087			−0.024	0.087
12	14	0.813	0.875	0.726	0.149			−0.087	0.149
13	15	0.875	0.938	0.964	−0.026	0.089	0.089
13	16	0.938	1	0.964	0.036	0.026	0.036

Determination of construction process duration based on labor productivity estimation: A case study

Article Category: Research Paper

Published Online: Nov 20, 2021

Page range: 2521 - 2538

Received: Mar 21, 2021

Accepted: Sep 30, 2021

DOI: https://doi.org/10.2478/otmcj-2021-0031

Keywords
mean value, standard deviation, productivity, sample relative frequency, probability theory, hypothesis test

© 2021 Darja Kubečková et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Plastering works – Distribution of number of plasterers in work queue no.1

Plastering works SO J 34

Calculation of observed value XOBS – originally wrongly numbered 2

Determination of construction process duration based on labor productivity estimation: A case study

Article Category: Research Paper

Published Online: Nov 20, 2021

Page range: 2521 - 2538

Received: Mar 21, 2021

Accepted: Sep 30, 2021

DOI: https://doi.org/10.2478/otmcj-2021-0031

Keywordsmean value, standard deviation, productivity, sample relative frequency, probability theory, hypothesis test

© 2021 Darja Kubečková et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Plastering works – Distribution of number of plasterers in work queue no.1

Plastering works SO J 34

Calculation of observed value XOBS – originally wrongly numbered 2

Keywords
mean value, standard deviation, productivity, sample relative frequency, probability theory, hypothesis test