The purpose of this study is to examine the significant impacts of effective communication towards the performance of the construction organization. The objectives of the study include to identify impacts of effective communication and evaluate the degree of agreement to which effective communication influence construction organization from construction contractors and consultants' viewpoint. A sample of 200 construction contractors and consultants were randomly selected from the Bureau of Public Procurement (BPP) database, out of which the responses rates received were 160 (80 %). Data analysis include Relative Importance Index (RII) for ranking comparison among the construction professionals on a scale range from 1-5 for rating their responses. Kendall's coefficient of concordance was used to evaluate the degree of agreement between construction professionals related to the ranking of each group of the practices. The results of RII revealed that improve productivity in the organization, reduce project delay, better safety precautions on construction sites, better use of materials and equipment and improve professional commitment to the organization are the top five impacts of effective communication towards the performance of construction organization. The results of Kendall's coefficient of concordance revealed that a high agreement between construction professionals occurred in the ranking of the impacts of effective communication towards the performance of the construction organization. The findings revealed that effective communication help to facilitate better understanding among all parties in the construction organization. It was recommended that stakeholders in the construction organization should adopt the use of effective communication tools and instruments for organizational performance.

The construction industry is one of the main economic sectors that contribute significantly to social and economic development. However, the lack of skilled labour is one of the factors affecting the success of projects in the construction industry. Skilled labours are the potential for enhancing overall delivery of construction projects to achieve sustainability. Building and construction industry in Makkah has continued to respond to shortages of skilled labours. Hence, the purpose of this study is to evaluate the importance of factors influencing the shortage of skilled labours from the perceptions of construction practitioners. In order to achieve the aims and objectives of this study, the quantitative descriptive method was adopted for this research study, and data for this study was collected through a stratified random sample of construction practitioners in Makkah. Data were first analysed by way of Analysis of Variance (ANOVA), followed by Relative Importance Index (RII) for ranking comparison among the construction practitioners. The results of RII indicates that the significant factors influencing the shortage of skilled labours in Makkah include delay in salary payment, low wages structure, lack of motivation system, health and safety issues on construction sites, lack of job security, bad relations between skilled labours and management team, poor living conditions, Slow recruitment of skilled labours, restricted government regulations, and exposure of climate conditions. The findings revealed that the factors rated are required for organisational performances which are essential in achieving sustainable building and construction in Makkah.

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Knowledge generated during construction projects is wasted as a result of a lack of awareness of the benefits of sharing knowledge. Moreover, knowledge is scattered in the construction firms through various documents and individual brains without a platform to retrieving it for sharing among the employees. Therefore, this paper aims to assess knowledge sharing practices in Nigerian construction firms. A detailed review of relevant literature was conducted with the view of collecting relevant data necessary for this paper. A total of 150 numbers of questionnaires was distributed to Engineers, Quantity surveyors, Builders and Architects in construction firms that are based in Abuja. The descriptive method of analysis was used to analyze the data obtained from the survey. The result shows the followings as methods of knowledge sharing practices in Nigerian construction firms: (1) face to face interaction, (2) site & Departmental meetings, (3) mentoring and tutoring, (4) project briefing and interviewing session, and (5) internal training courses. In addition, the followings were established as construction activities that are commonly used for knowledge-sharing practices: (1) site visitation, (2) estimation & price forecasting, (3) evaluation of BOQ, (4) preparation of scheduling for site activities, (5) development of tender programme, (6) taking off and (7) understanding of construction technologies and methods. Therefore, the paper recommended that the top management should encourage knowledgesharing practices in the construction firms through face to face interaction, seminars/workshops, and post-project review.