1 6. İnşaat Yönetimi Kongresi, Kasım 2011, Bursa 321 Design and Design Management in Building Projects: A Review Abstract Rıfat Akbıyıklı 1, David Eaton 2 Design is that activity, largely executed by consultants and in-house disciplines, which translates the aspirations of the Client, into a series of documents, both drawn and written, which in combination can be used to procure the manufacture, assembly, commissioning and operation of both building elements and the project as a whole. Management of the design process is planned to ensure that the project requirements have been correctly interpreted in an agreed brief, with a consistent format of technical verification reports and design analysis audit trail, as set out in the project plan. This paper, based on a literature review, examines traditional design management and design and construction as an integrated system. The paper is an introductory part of an ongoing project to map design and design management practices in architectural and civil engineering practices. Keywords: Design, Design Management, Design Integration, Procurement Routes, Teamwork 1 Sakarya University, Department of Civil Engineering, Esentepe Campus, Adapazarı Sakarya, Tel: , 2 School of the Built Environment, 4th Floor Maxwell Building, University of Salford Salford, Greater Manchester, M5 4WT, United Kingdom, Tel: +44(0)
2 İnşaat Yönetimi Kongresi, Kasım 2011, Bursa Bina Projelerinde Tasarım ve Tasarım Yönetimi: Bir Ġnceleme Rıfat Akbıyıklı 1, David Eaton 2 Özet Tasarım, genellikle müģavirler ve Ģirket içi disiplinlerce yapılan ve ĠĢveren in amaç ve isteklerini hem bina ve hem de projenin tümünün üretiminin elde edilmesine, montajına ve onay ve teslimatı ile iģletmeye alınmasında kullanılan çizili ve yazılı bir seri dokümana dönüģtüren bir aktivitedir. Tasarım prosesinin (sürecinin) yönetimi, proje planında öngörüldüğü ve ortaya konduğu gibi projenin gereksinimleri önceden üzerinde mutabakat sağlanmıģ olan ve uyumlu formatta teknik tahkik raporları ile tasarım analizinin doğru bir özet raporuna dönüģtürülmelerini sağlamaktadır. Literatür incelemesine dayalı olan bu bildiri, geleneksel tasarım yönetimi ile tasarım ve yapımını bütünleģik bir sistem olarak incelemektedir. Bu bildiri, mimarlık ve inģaat mühendisliği bürolarının tasarım ve tasarım yönetimi uygulamalarının ayrıntılı bir haritasının çıkarılmasına iliģkin devam etmekte olan bir çalıģmanın baģlangıç bölümüdür. Tasarım bir kreativite (yaratıcılık) aktivitesi olarak vaka toplama ve özet ön bilgi toparlamadan ayrı bir süreçtir. Tasarım sentezi; projenin kalitesinin, maliyet planının, ihale elde edilmesinin ve yapım programlarının kurulabilmesi için kullanılmaktadır. Bu referans araçları daha sonra projenin iģ ilerlemesi, maliyet ve kalite parametrelerine karģı sürekli olarak ölçülebilen performans parametreleri olmaktadır. ÇeĢitli çalıģmalar, eksik ve hataların büyük bir yüzdesinin tasarım etaplarında alınan karar ve aksiyonlar nedeniyle oluģtuğunu tespit etmiģtir. (Cornick 1991) Buna karģılık zayıf bir tasarımın ise yapım aģamasındaki etkinlik seviyesi üzerinde çok etkisinin olduğu tespit edilmiģtir. (Ferguson, 1986) ÇağdaĢ yapıların artan karmaģıklığı, zaman (süre) ve kalite terimleri ile tasarımın performansının iyileģtirilmesi için bir baskı unsuru oluģturmaktadır. Önemli olmasına rağmen tasarım prosesinin yönetimi için, üretim (yapım) yönetimi ve genel proje yönetimi için harcanandan daha az araģtırma süresi ve çabası harcanmıģtır. (Austin ve diğ. 1994; Koskela ve diğ.1994) 1 Sakarya University, Department of Civil Engineering, Esentepe Campus, Adapazarı Sakarya, Tel: , 2 School of the Built Environment, 4th Floor Maxwell Building, University of Salford Salford, Greater Manchester, M5 4WT, United Kingdom, Tel: +44(0) ,
3 6. İnşaat Yönetimi Kongresi, Kasım 2011, Bursa 323 Tasarımın yönetilmesi zor bir süreçtir. Çok belirsiz bir çevre Ģartları içerisinde bazen belirli bir yıl süre alan binlerce karar, sayısız birbiri ile iliģkiler içermektedir. Ayrıca mimar, yapı mühendisleri, servis mühendisleri (elektrik, makine, havalandırma, tesisat) ve pazarlama mühendisleri gibi çok sayıda personele ihtiyaç duyulmaktadır (Powell ve Newland, 1994). Bu nedenle tasarım sürecinin karmaģıklık ve belirsizliğini minimize etmek için etkin bir planlama ve kontrol gerekmektedir. Zayıf iletiģim, eksik dokümantasyon, yanlıģ veya eksik girdi bilgisi, dengesiz kaynak ve tahsisat, disiplinler arası koordinasyonsuzluk ve yanlıģ karar alma tasarım yönetimindeki ana problemler olarak belirlenmiģtir (Cornick, 1991; Austin ve diğ. 1994, Koskela ve diğ. 1997). Anahtar kelimeler: Tasarım, Tasarım Yönetimi, Tasarım Entegrasyonu, Satınalma Yöntemleri, Takım ÇalıĢması Introduction Design activity is largely carried out by consultants and in-house disciplines, which translate the aspirations of the Client, into drawn and written media which can be used to procure the construction, commissioning and operation of the whole project. Design, as a creative activity is separate from the fact gathering and brief assembly process that precedes it. Design synthesis is used to establish the quality of the project, the cost plan, procurement and construction programs. These reference tools then become the performance parameters against which progress, cost and quality can be continuously measured. Studies have identified that a large percentage of defects arise through decisions or actions in design stages (Cornick, 1991) whilst poor design has a very strong impact on the level of efficiency during the production stage (Ferguson, 1986). The increasing complexity of modern buildings has significantly increased the pressure to improve the performance of the design in terms of time and quality. Despite its importance, less research time and effort has been dedicated to the management of the design process, than to production management and project management in general (Austin et al, 1994; Koskela et al, 1997). The small relative cost of the design process when compared to production costs disguises its true importance for overall performance (Austin et al, 1994). Design is a difficult process to manage. It involves thousands of decisions, sometimes over a period of years, with numerous interdependencies, within a highly uncertain environment. A large number of design personnel are needed: architects: structural engineers; service engineers; and marketing consultants (Powell and Newland, 1994). The design process therefore needs effective planning and control to minimise the effects of complexity and uncertainty. Poor communication; lack of adequate documentation; deficient or missing input information; unbalanced resource allocation; lack of coordination between disciplines; and erratic decision making; have been identified as the main problems in design management (Cornick, 1991, Austin et al. 1994, Koskela et al. 1997).
4 İnşaat Yönetimi Kongresi, Kasım 2011, Bursa Nature of Traditional Design Management (DM) Construction design is a specialised and highly demanding form of problem solving (Pressman, 1993; Lawson, 1997) where Stakeholders needs and requirements are conceptualised into a physical representation of procedures, drawings and technical specifications (Freire and Alarcon, 2000). It is a dynamic and complex multidisciplinary process, performed in a series of iterative steps to conceive, describe and justify increasingly detailed solutions to stakeholders needs (Sterman, 1992; Ogunlana et al, 1998; Baldwin et al, 1999). It is the key project process (Morris et al, 1999; Cockshaw, 2001), defining up to 70% of the final product cost (Kochan, 1991) and adding value by delivering: functionality; quality; enhanced services; reduced whole life costs, construction time and defects; while delivering wider social and environmental benefits (Treasury Task Force, 2000; Prescott, 1999). Effective design management ensures that all project requirements have been correctly interpreted in an agreed brief, with a consistent format of technical verification reports and design analysis audit trail, as set out in the project plan. In that respect, DM is an emergent professional discipline which separates the management function of a project s design phase from the design function. It is increasingly important in construction projects (Gray and Hughes, 2001). It is closely aligned to project management, to provide a fully co-ordinated project, on time, meeting all stakeholder needs by co-ordinating, controlling and monitoring design activities while interfacing with other project and external parties. It is typically realised by a design manager or team of managers depending on a project s size and complexity. Design planning An effective and workable design programme is essential to exert managerial control over the design process and improve co-ordination between parties (Austin et al, 1994). The low priority of design in project planning is attributed to construction accounting for the majority of the project costs. It is now recognised that construction efficiency and costs are heavily dependent on the quality of the design solution (Austin et al, 1998) and availability of information and hence the quality of the design programme. Newton and Hedges (1996) claim there is a poor understanding of the interdependency of information flows because separate disciplines do not understand how their work contributes to the whole, causing a fragmented approach to planning. The identification and co-ordination of cross-disciplinary information is left to the expertise of the design planner or project manager (Baldwin et al, 1994). This creates implications for the coordination of discrete design disciplines and general process control. Another facet of poor design planning is that resource allocation is often unbalanced (Cornick 1991, Austin et al 1994, Koskela et al 1997a). This can cause initial delays (Koskela et al 1997b; Love et al, 2000) but can also escalate into further problems.
5 6. İnşaat Yönetimi Kongresi, Kasım 2011, Bursa 325 Information management The principal management activity of any project is the processing of information (Baldwin et al, 1994; Heath et al, 1994), yet in the construction industry this is poorly performed (Latham, 1994; Kagioglou et al, 1998). Management is predominantly through schedules (Ballard, 1999) programmed to achieve the required information release to contractors (Austin et al, 1998). It does not consider the internal logic of the design process poor planning is a factor in poor information management (Formoso et al, 1998). As a result information transfer is not properly controlled; designers do not have the right information at the right time and are overloaded with unnecessary information (Huovila, 1997). This creates the risk of failure of design tasks, deficient analysis and wrong decisions with potential waste in the process due to rework (Huovila et al, 1997; BRE, 1995; O Brien, 1997; Frankenberger & Badke-Schaub, 1998). The erratic delivery of information and unpredictable completion of prerequisite design quickly results in the abandonment of design planning (Huovila et al, 1997), therefore perpetuating a cycle likely to create further difficulties. Design Changes Traditional construction is sequential with a low degree of collaboration between different domains. Over-specialization of functions leads to significant problems. Primarily, these result from the separation of design, engineering, and production and the inability of these functions to communicate effectively. Design changes are a significant problem having large administration costs (Machowski and Dale, 1995), accounting for 40-50% of total design hours (Koskela, 1992) and even in well-managed projects can cost between 5 to 15% of total construction costs (Morris et al, 1999; CIDA, 1994; Burati et al, 1992). When measured by cost, design caused defects are the biggest category of construction defects. Of design caused defects, those originating from missing coordination between disciplines form the largest category. Love et al (2000) highlight that such costs should be even higher as they do not represent the latent and indirect costs, nor the disruption of schedule delays, litigation costs and other intangible aspects such as buildability (Kagioglou et al, 1998). Morris et al, (1999) suggest that even well-managed projects led by industry leading managers, two-thirds by cost, of design changes are avoidable. This offers significant potential for improvement. Newton and Hedges (1996) observe that traditional DM techniques cannot predict the effect of change on the design programme and fees. As such, it is difficult to determine all the possible change paths and select the best (Mokhtar et al, 2000). Thus, if current tools cannot determine the impact of design changes and human judgement is unable to account for the interactions that determine its outcome (Richardson, 1991; Sterman, 1992) then design changes are made without exposure to all potential impacts. Such inability to predict the impact of changes must be considered as a barrier to effective control of design changes and therefore management of the design process. If change control is improved then there is more chance of project success.
6 İnşaat Yönetimi Kongresi, Kasım 2011, Bursa The management of design is problematic due to the following design problems: Poor briefing and communication; Inadequacies in the technical knowledge of designers; Lack of confidence in preplanning for design work; Lack of adequate documentation; Deficient or missing input information; Unbalanced resource allocation; Lack of coordination between disciplines; Erratic decision making; Lack of effective planning and control to minimize the effects of complexity and uncertainty. (Ballard and Koskela(1998) and Tzortzopoulos and Formoso (1999) While sites can operate on a definition of quality as conformance to requirements, design must produce those requirements from identification of client needs! Many design decisions are reciprocally independent, making the management of work flow among the various specialists important and difficult. Early design stages are notoriously hard to evaluate and against progress milestones. In general, the design phase, being one of the early phases of the project life cycle is found to be a major source of problems for the subsequent phases, even to the extent of undermining systematic management during construction (Ballard & Koskela, 1998) (Figure 1). Design activity Consultant design Overlapping wedges Trade design Briefing Design Engineering Procurement Construction Occupation Project Life-Cycle Figure 1. Design Activity versus Project-life Cycle To overcome these problems, new methods of working and organizational structures which facilitate and integrate design, development and production are necessary.
7 6. İnşaat Yönetimi Kongresi, Kasım 2011, Bursa 327 Design and Construction as an Integrated System Construction involves many people with different skills, knowledge and interests working together for a short period and then separating upon completion of the project. This creates problems for both the design and construction processes, due to the large number of interfaces and communication difficulties (Kagioglou et al, 1998). Therefore, while it is clear that the integration of design and construction is vital to project success it is also a fundamental weakness in the industry (Egan, 1998). Integration during the design phase is also crucial. It prevents problems in subsequent phases, and is necessary for the development of suitable design solutions (Mitropoulos and Tatum, 2000) and ultimately to achieve client satisfaction (Ferguson and Teicholz, 1992). The existing construction system consists of independent professionals - The designer, contractor and client relationship is a linear delivery system. These processes can also be viewed as an integrated system: Design is a process of defining a client s requirements, represented by detailed plans and specifications; Construction planning is a process of identifying activities and resources required to realize the plans and specifications as a physical reality; Construction is the implementation of the activities and resources to deliver a facility to meet the clients requirements. The two central aspects of an integrated construction system are: An underlying common data model to permit data integration between phases; System control mechanisms to integrate operational efficiency. In an integrated system design and construction planning proceed simultaneously, examining various alternatives from both viewpoints thus eliminating the necessity of extensive revisions under the guise of value engineering. In order to support integrated design and construction, information must be shared, and managed to actively promote integration. The review of design and constructability can then be carried out concurrently as the project progresses seamlessly from design to construction. Design stage decisions are multi-dimensional - made by individuals often belonging to different organizations - combining factors ranging from the highly subjective to the perfectly objective. They are made over prolonged periods of time in an iterative manner and may be revisited weeks, months and even years after they were originally taken. There is considerable potential for misunderstandings, inappropriate changes, changes which give rise to unforeseen difficulties, decisions which are not notified to all interested parties, and many other similar problems. However, the concept of a truly integrated system cannot be realized whilst the owner assumes the traditional risk-reward dilemma. Alternative forms of risk transfer are a pre-requisite.
8 İnşaat Yönetimi Kongresi, Kasım 2011, Bursa Design Stages and Methodology The basic approach to design relies on decomposition and integration. Since design problems are large and complex, they have to be decomposed to yield sub-problems that are small enough to solve. Alternative ways to decompose design problems are: Decomposition by functions of the facility; By spatial locations of its parts; By links of various functions or parts. Functional Design - The objective of functional design is to treat the facility as a complex system of interrelated spaces which are organized systematically according to the functions to be performed in these spaces in order to serve a collection of needs. The arrangement of the physical spaces is an iterative process. Selected rules or strategies (heuristic approach) are used in search of a solution. This approach is based on the following considerations (Hendrickson, 1989). Identification of the goals and constraints for specified tasks; Determination of the current state of each task in the iterative process; Evaluation of the differences between the current state and the goals; Directing the search towards the goals on the basis of past experience. Structural Design - involves synthesis and analysis. Synthesis is inductive while analysis is deductive. Synthesis is more akin to creativity than to knowledge. The conception is subjective since there is no established procedure for generating innovative and successful alternatives. The initial selection relies on the judgment of the designer. Once selected it is vigorously analysed to ensure that it can sustain the demands of its environment. For traditional structures (E.g. office buildings), standard systems are derived from the past experience of many designers. However, in many situations, designs must be developed to meet particular requirements. The interplay of structural form and materials affects the selection of a structural system, which in turn may influence the method of construction (Figure 2). Design Management Research Design management research has focused on: design planning and controlling change (Austin et al, 1998); control of design activities (Ballard and Howell, 1998); managing the integration of design phase teams (Austin et al, 1999; Austin et al, 2001; Business Round Table, 2002); and collaborative working (Steele et al, 2001).
9 6. İnşaat Yönetimi Kongresi, Kasım 2011, Bursa 329 ASSUMED (SUPPOSED) LOADS STRUCTURAL MODEL CHECKING System Materials Dimensions Calculations Section Forces Deformations Checking stresses Other Structural Solutions; economy Dimensioning Detail design and drawing Execution (Production) Figure 2. Structural Design Flow for Buildings There is much material to draw on in terms of identifying problems but there are few practices on which research has been able to build. Work by Austin et al (1999), Cross (1989), Gray et al (1994), Gray and Hughes (2001), Kagioglou et al (1998) and Process Protocol 2; Lafford et al (1998), has influenced this research. Other industries offer significant work for adaptation to construction. Lean Production (Womack et al, 1990), and Concurrent Engineering (Sheath et al, 1996) are initiatives from the automotive, manufacturing and aerospace industries which hold valuable lessons for managing the construction design process. They offer useful guidance for improving the DM process in the construction industry. However, the construction environment is significantly more complex than manufacturing, automotive and aerospace industries and consequently such innovations require more development to be implemented successfully (Marosszeky & Karim, 1997). New Paradigm - variability in the future has to be considered when trying to envision the design management. The properties of adaptability and self-correcting systems that evolve to meet change whilst respecting the constraints of the environment are critical to the development and control of design. A paradigm shift in storing and communicating design information has occurred. The object model allows design and analysis simultaneously across the life of the project. This shift implies a different way of thinking. The International Alliance for Interoperability (IAI) universal objectoriented data model (IAI, 2011) suggests that a holistic or systems approach to the process is necessary to make the new paradigm work. This is a major cognitive shift.
10 İnşaat Yönetimi Kongresi, Kasım 2011, Bursa Building Information Modelling (BIM) is an important aspect of this strategy, enabling the exchange of interoperable digital data. This representation includes 3D geometry, 4D phasing (3D space + time), 5D costing (4D + cost), as well as spatial information, geodesic information, and properties of building components and elements. Conclusions; Emerging Trends, Future Issues and Vision The construction industry has changed markedly over the last twenty years and this has put an increasing pressure on design teams and design professionals to deliver. The key trends affecting design team performance can be summarized in the following three areas: Contractors at the Heart of the Design Process: - The establishment of Design-Build procurement and the increasing use of PFI (Private Finance Initiative) has led to earlier contractor involvement. Contractors can now find themselves at the heart of the design process, in a position to influence or control design outcomes. In the worst examples of contractor-led projects the design team is treated as just another member of the supply chain and the inherent importance of good design is often lost by a one dimensional approach to management. Typical construction management methods are not applicable to design and new methods need to be adopted for managing design work. Increasing Specialism within Design - The complexity of modern materials, systems and solutions require defined specialist knowledge such that designers move from being generalists to specialists. More designers are involved, which is further compounded by the increasing importance of design input from trade contractors. With more parties and more technically complex solutions, even the most experienced Design Manager can fail to ensure that correct information is supplied at the correct time. Recognition that Design is a Process - The traditional view is that all designs are unique and therefore cannot be planned or managed. This view is no longer valid; design is a process, which if correctly represented can be repeated from one project to the next and can be defined, measured and improved upon. It is now possible to pay design teams in a similar manner to contractors, based on their performance, avoiding exhaustion of fees before design is complete. By defining the process and measuring the design team s output, the design team can be properly managed and their fee based on performance rather time spent. Brandon (1999) stated his vision as: A competitive industry working collaboratively for mutual advantage in order to reduce conflict, aid communication, seek efficiencies, upgrade the industry and its staff to be comparable with other industries, delivering a product over its full life-cycle which is of high quality, and high value and responsive to time objectives by those commissioning the product. In a fast changing design environment, the value of management decisions depends on:
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What is effective Design Management? Design Management is becoming increasingly recognised as critical to the success of complex construction projects. However, the role of the Design Manager is poorly
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