One of the most important factors affecting the growth of the construction industry is productivity. In various industries, including the construction industry, productivity reduces time, cost and efficient use of resources. components such as management factors, material factors; design and technical factors; work factors; regulatory factors; equipment factors; political and legal factors; Environmental factors and motivational factors can affect productivity in the construction industry. Therefore, according to the wide range of influential components, this research is aimed at identifying and prioritizing internal effective factors on productivity in the construction industry. The statistical population of this research is 30 managers and experts in the construction industry, and due to the limited available statistical population, the full number method will be used. In the literature review phase, 126 factors affecting productivity in different industries were identified. After summarizing, redefining and retrieving examples in the construction industry, it became 65 factors affecting productivity in the construction industry. In order to analyze the data, confirmatory factor analysis was used and AHP hierarchical analysis was used to prioritize the effective components in productivity in the construction industry. The final research model has been confirmed with 65 indicators in 6 factors. The findings of the research show that among all the components, the job motivation component is in the first place and the workshop environment component is in the second place. The third, fourth, fifth, and sixth places are respectively the components of management factors, supply chain, design factors, and education and learning. In the job motivation component, job satisfaction has the highest coefficient of determination. Therefore, it is necessary to pay more attention to job satisfaction, including fairness without a reward system, salary and benefits according to the activities performed.

The construction industry has always been influenced by new, emerging and advanced technologies throughout its history. Technological developments have led to increasing changes in many areas of the construction industry. This research investigated the technological changes and developments in the field of construction industry by adopting a future-research approach. The purpose of this study was to identify key technological factors affecting the future of the construction industry. First, using library studies, technological advances affecting the construction industry were identified. Examining the available documents and books, 18 drivers were identified in four areas: "design", "construction", "maintenance, repair and operation" and "management". Then, among the drivers determined, using the method of structural analysis and based on the opinion of experts, the key technological factors that will have the greatest impact on the future of the construction industry were identified. Research data was analyzed using MICMAC software. The results of using structural analysis method indicate that 9 key factors including building information modeling (BIM), new energy consumption simulation software, virtual reality and augmented reality, intelligent structural systems and facilities, 3D printers, prefabrication, modularization, robotics and blockchains will have the greatest influence on the future of the construction industry.

Innovation strategy is the basis of success in innovation and performance improvement. This paper represents a model related to the most important innovation strategies which have a significant impact on performance of industries. Then, it examines the relationships between innovation strategies and diversity and development of the performance. So, the empirical research was carried out in Iranian construction industry and practical data were gathered out of7main industry institutions and 93 construction SMEs by questionnaires to examine paper objectives. The findings show that innovation strategies such as proactive, analyzer, futuristic and aggressive strategies influence on the performance development of the industry. Also, strategies such as proactive, risk taking and futuristic ones are the most effective innovation strategies in the performance diversity. Results of this study suggest that to achieve performance diversity and development, construction industry's policy makers and top managers should implement and promote pro active and futurity strategies, simultaneously, across the industry.

Polyurea has drawn the attention of construction activists and engineers as a modern building material due to its unique structure, unique properties, and relatively easy application even in hard-to-reach places. A wide range of excellent properties such as durability and high resistance against the atmospheric, chemical, and biological factors have made this polymer a superb option for the construction industry. The ability to reinforce the building materials and structures coupled with excellent resistance against corrosion and abrasion has dramatically increased the popularity of polyurea as a protective coating in the construction industry. In these industries, sealing and insulating the different floors and surfaces have also been considered using the polyurea coating. Polyurea coating technology is a green technology without pollution and toxicity to the environment, which is an essential advantage over many competing technologies in the construction industry. The use of polyurea composite systems to optimize various properties such as mechanical and thermal properties in addition to reducing the costs and economic burden is increasing. In the present paper, multiple applications of polyurea-based materials in the construction industry are discussed.

Construction industry has one of the highest rates of fatalities and injuries compared to other industries, despite technological advancements and implementations of occupational health and safety initiatives. According to the reports, the construction industry have the highest accident rates in all industries, and is the site of the most serious accidents in terms of severity of injuries. The industry accounts for 7% of the global workforce, but is responsible for 30-40% of fatal injuries. According to Gorkanli and Mongen in developing countries, the risks associated with the construction industry are three to six times higher than in other industries. Researches show that organizations and companies that have developed and applied safety and health management experience fewer work accidents. The construction industry is aware of the importance of proper safety performance in projects, so the need to improve safety performance in the construction industry is essential. Researches show that there is a qualitative and quantitative relationship between safety culture and safety performance, both theoretically and empirically. Researches show that an organization can construct a positive safety climate and then exhibit an outstanding safety performance by creating a proactive safety culture. The most comprehensive way to move forward in order to achieve a safety culture is to learn steps called strategic goals to improve safety performance, each set of steps leading to an organizational milestone. Therefore, in this research, using Grounded theory qualitative research method and using literature studies and semi-structured interviews with experts, the indicators and sub-indicators of each step are extracted and presented as a model. In this study, the snowball sampling method was used, which was finally sufficient to saturate the data. Note that this model is not a complete formula; Rather, it is a framework for decision support that can be used to make strategic decisions.

There is no doubt that human resources have a significant role in running any successful business. The literature indicates that this role is almost neglected in the construction industry. One of the important factors to increase productivity in various industries is to increase the productivity of human resources. Human resource productivity is a function of various factors where motivation is one of the most important factors. Considering the effect of motivation on innovation and the necessity of innovation in construction design firms, studying motivational factors of Architects and Engineers (AE) is of great importance. In this research, the most critical factors affecting Architects’ and Engineers’ motivation were recognized through literature review. These factors were classified into five main categories including Leadership and management, service compensation system, organizational atmosphere, social status, and job nature (current tasks – immediate situation and job development). Then, the factors were ranked by the industry experts through online questionnaires. Learning opportunity, distributive, procedural & interactional justice, and job promotion opportunity were ranked as the top critical motivational factors. However, it must be noted that important factors may differ considering the demographic properties of the interviewees. As a result, factors were ranked considering demographic factors including gender, marital status, age, educations, years of experience, and profession (civil engineer and architect). Finally, it should be noted that motivation of engineers and architects depends on several factors that must be considered in the design of human resource subsystems such as job analysis, performance appraisal and service compensation, training systems, and promotion to improve performance and increase productivity. In addition, motivation is one of the most important factors affecting personnel retention. Therefore, human resource management experts are advised to provide necessary grounds to increase the motivation of construction industry employees by designing appropriate human resource systems.

Research in building information modeling and sustainability studies has been increasing recently. However, few studies have been conducted to examine the integration of building information modeling technologies to strengthen the implementation of sustainability methods in the construction industry. Building information modeling technology is one of these methods because it creates vital databases for the building and its components instead of generating and displaying rich information IDs. As a result, executive management's time and costs are significantly reduced because of the ability to make optimal decisions regarding the implementation of projects at each stage. It has provided the construction. Building information modeling technology as a powerful manager tool improves project success criteria. This study aims to identify the dimensions and components affecting the sustainable development of the construction industry based on building information modeling. The method used in this research is Grounded Theory based on the study's exploratory nature. The primary basis of data collection is in-depth interviews with experts, professors, and construction project specialists of Tehran Municipality, District 3. A total of 15 interviews were conducted. After collecting the information, the codes related to the written interviews were analyzed. After performing three steps of open coding, axial coding, and selective coding, the final research model was presented. The codes obtained from the interviews were categorized into 55 concepts and 14 main categories. According to the results of this study, building information modeling and optimal building design are influenced by a range of environmental and causal factors. An integral part of the sustainable development of the construction industry is the integration of contractual models and sustainability development. The use of natural resources, the product, and the training of organizational and macro management and technology are included.

Recent innovations in the construction process should be noticed in the total context of the technological development of human societies over time. There is a general impression that the extensive advantages in productivity and quality, reached in manufacturing industries, have not been matched by similar progress in building construction. This paper reflects this deep belief that a significant order to this problem can be attained only with prefabrication, industrialization and automation replacing manual labor in all phases of the construction process. Prefabrication and industrialized building systems are the processes of an investment in construction equipment, facilities, and technology with the purpose of increasing output, saving manual labor, and improving quality. These building systems increase productivity and improved the performance and quality of the construction components. Moreover, they are a set of interrelated components that act together to reach the defined performance of a building. In a wider sense they also include several technological and managerial methods for the producing and assembling of their components for this intention. Many of possible construction components are prefabricated offsite at a central facility where specialized equipment and organization can be established for this purpose. The several building works are incorporated into large prefabricated assemblies with minimum erection, jointing and finishing work onsite. Materials and component handling onsite are widely mechanized and in concrete work, large standard steel forms, ready-mixed concrete, and concrete pumps are used. Design, production, and erection onsite are strongly interrelated and must be viewed as parts of an integrated process which has to be planned and coordinated accordingly. Automation is introduced into the prefabrication building systems in realization process in order to reduce human involvement and improve quality in design, production, and construction onsite. In this paper, the possibility of using prefabricated construction systems in building industry is discussed. These argued subjects are: • Analyzing of Demolition Management in Construction, • Analyzing of Benefits and Disadvantages of Prefabrication Building Systems and Applying these Construction Methods in Building Industry, • Presenting an Effective Patterns in Using Prefabrication in Construction of Various Buildings, • Economic Analysis of Applying Prefabrication Methods in Building Industry. A lot of prefabricated components are vastly applied in construction. They have potential to reduce waste production and minimize negative environmental impacts of buildings. In order to compare advantages, disadvantages, barriers and development of prefabrication in building sites, a questionnaire was presented to proper and qualified building constructors in Tehran city, Pardis and Parand new towns. Required data are collected and extracted from completed questionnaires and in order to simplify the analysis of data, findings are categorized in tables. Finally, advantages, disadvantages and future developments of applications of prefabrication are presented and appropriation of these building systems is analyzed for different types of construction projects according to the categorized and meaningful tables. It can be inferred from the findings that various advantages of prefabrication have different values. “Supervision of increasing the quality of prefabricated components” item has the highest value and “better and improved design” and “decreased total costs” are the next main items. In the other hand, some disadvantages of prefabrication systems are noticed, too. Findings show that prefabricated buildings are not flexible or adaptable to future changes. In most cases, after compilation of prefabricated buildings, end-users can’t modify them easily. Thus, “rigidity to change” is the main disadvantage of prefabrication. Some findings related to future developments demonstrate that prefabrication construction methods should be considered in preliminary design process in order to achieve the upper standardization level. “Upgrading construction techniques” and “fitting to the future projects” are the second significant items supporting the future improvements. In addition, feasibility of applying prefabrication in building projects was discussed. Five basic items (sub-structure, structure, exterior construction, interior construction and building installation) were analyzed focusing on main projects, mass housing, personal housing and commercial projects. It can be shown that conventional construction methods are suitable for foundation, sub-structure and non-standard construction. Prefabricated components are preferred to steel structural frames, facades, concrete roofs, dry-wall systems. Many of prefabricated components are load-bearing elements and development of lightweight prefabricated components should be considered in order to reduce the use of raw materials and shipment. In addition to the above items, nowadays large quantities of waste are generated in building industry while most of its significant environmental aspects remain unnoticed. Conventional systems seem to be unable to provide satisfactory results in building industry. Based on the results, by using prefabrication methods, construction waste could be reduced to half and the most reduction will be in wall finishing and coating phase. Also, using standard and regular designs for buildings will be helpful. Moreover, through mechanization, using recycled or recyclable materials and industrial assembly of prefabricated components, the costs could be reduced.