Research methodology means the overall strategy designed to achieve the aim and objectives of the research. A research method is a tool used to search for and gain new knowledge. In a research context, there are many tools to choose between, and all of them have their advantages and disadvantages. In this section, the researcher shall put down with explanation ,the basic research methodology
- Research design
- Research population
- Source of data
- Sample size
- Statistical technique used and others
Bastone et al (1988) said “research method should permit a high degree of flexibility and maximum collection of data in form which can carter for the richness of social life”. The research questions thus used were framed with these goals in mind, that is the research questions used were designed in such a way that would obtain the information needed to achieve the stated aim and objectives of the study. Data collected were based on research questions and majorly from report of daily progress of work on site.
Nine different construction projects from different regions of the country were appraised. In order to benchmark blocklaying labour productivity in Nigeria.
SAMPLE AND SAMPLE TECHNIQUE
The information is drawn from nine(9) selected projects from different parts of the country. The model of Thomas and Zavrski (known as the theoretical model for international benchmarking of labour productivity) was employed. This method allows the researcher to collect data from daily progress report record on site daily activities (blocklaying). Mean while the projects selected were selected based on types and magnitude of construction involved.
METHOD OF DATA COLLECTION
- Daily progress report record
- Personal interview
Daily progress report of blocklaying on site was the major source of data collection, though questionnaire and personal interview were also used. The questionnaire and personal interview were framed in a manner that will reduce vagueness and ambiguity for people responding to the questions. The questionnaire/personal interview was to determined how many pieces/meter square per day can a blocklayer lay. The questionnaire/personal interview also looked at the caliber of construction workers involved, it also contain some multiple choice responses.
PRIMARY DATA ON BLOCKLAYING
Primary data is fresh and first hand data collected from daily progress report record on site, and for the aim of this project, the primary data were gathered from nine construction projects located in different parts of Nigeria thus; Abia state, Enugu state, Ebonyi state all from the Eastern part of the country, Lagos state in the Western part, Abuja in the center, Kogi in the Northern part, Calabar and part Harcourt in the Southern part. The spread is aimed at representing the different geographical zones.
Secondary data was collected from text books, journals and publications from internet. The collection or gathering is basically aimed at evaluating the related literature and basic concept in the study.
The tools of data analysis used consist of
- The model of Thomas and Zavrski (known as the theoretical model for international bench marking of labour productivity), comprising two men steps. Thus;
(A) Determining project attribute which include collecting data pertaining to:
vTotal work hours
vBase line productivity and
vNumber of abnormal days
(B) Calculating project performance parameter (bench mark) these are;
vDisruptive Index (DI)
vPerformance Ratio (PR)
vProject Management Index (PMI)
From the above application, daily labour productivity for nine projects in different location in Nigeria are investigated.
(2) SIMPLE PERCENTAGE
Data obtained from the questionnaire were tabulated and percentages used to analyze them. The number of responses along the two-point range ie above and below was used to compute the percentages. Thus if the number of item responses are recorded for either above or below point range. The percentage response is obtained as
Where Y = actual out come/responses
M = that number of possible out come.
The use of percentage will either dissent or corroborate the result obtained from the model of Thomas and Zavrski (known as the theoretical model for international benchmarking of labour productivity).
Productivity simply refers to the out put of any aspect of production per unit of input. Productivity is important in the construction industry because of the size and contribution of the industry to the economy. However there are factors that affect construction labour productivity eg project uniqueness, technology, management, weather, motivation and others.
Often labour productivity is a key factor contributing to the inability of many contracting organization to achieving their project goals which include, most importantly, the project margin. Therefore, it is paramount to understand the main determinants of labour productivity, and to keep and compare accurate records of productivity levels across project. This approach which is simply referred to as benchmarking has gained popularity in many production and service industries. Established bench mark for labour productivity in any activity especially blocklaying helps the estimator to forecast labour in future projects.