Tag Archives: Scheduling

There’s a great Scheduling party in Atlanta this May!

Why not attend the Project Management College of Scheduling (PM-COS) annual conference either as a speaker or delegate and collect your ‘ticket to project success’?

pmcos2017

Some of the reasons for joining us at The Ritz-Carlton, Atlanta include:

  • CPM Scheduling has been around for more than fifty years.  How much is art?  How much is science?  Help us decide.
  • Network with schedule professionals from around the globe including many of the top practitioners and experts in the field.
  • Learn tips from experts such as the role that case law plays in schedule delay analysis.
  • Help us address important issues facing the scheduling profession today and how to resolve them as we move forward.
  • Attend presentations and panel discussions to learn the recent developments in the profession and how to implement them on your projects.

For more information and to register, visit us at www.pmcos.org!

Free, Exclusive Project Scheduling Virtual Event for PMI Members

pmi-virtual-scheduling

PMI members are entitled to register and attend this member-only event on the 29th March (9:00 am to 5:00 pm ET) for free! It is the perfect way to learn what’s new in project scheduling and network with PMI members across the globe. This year we are talking about how to tackle project scheduling challenges in a changing profession.

My presentation is focused on Projects Controls Using Integrated Data – The Opportunities and Challenges.   The presentation is focused on the practical and ethical challenges posed by integrated information management tools such as BIM and ‘drones’ in the construction/engineering industries and how this affects the work of project controls professionals.

To register go to: https://www.projectmanagement.com/events/356123/PMI-Scheduling-Conference-2017

If you are not a PMI member (or cannot make the date) watch this space.

 

The future of project controls

Last week I participated in two PUXX panel discussions in Perth and Sydney focused on predicting the influence of technology on project controls.  The range of subjects covered ranged from drones and remote monitoring to virtual reality.

Many of the topics discussed offered better ways to do things we already do, provided we can make effective use of the data generated in ever increasing quantities – significant improvements but essentially ‘business-as-usual’ done better. The aspect I want to focus on in this post is the potential to completely reframe the way project schedules are developed and controlled when existing ‘gaming technology’ and BIM are synthesised.

The current paradigm used for critical path scheduling is a (dumbed-down) solution to a complex set of problems required to allow the software to run on primitive mainframe computers in the late 1950s – the fundamentals have not changed since! See: A Brief History of Scheduling.

The underlying assumption is a project consists of a set of activities each with a defined duration and depending on the logical relationship between the activities, some are ‘critical’ others have ‘float’.  The basic flaw in this approach can be demonstrated by looking at the various options open to a schedule to define the work involved in 3 simple foundations involving excavation and mass concrete fill.

schedule-options

All four of the above options above are viable alternatives that may be chosen by different schedulers to describe the work using CPM, and none of them really describe what actually happens. The addition of more links would help but even then the real situation which is one resource crew visits three locations in turn and excavates the foundations, a second crew follows and places the concrete with some options for overlapping, parallel working and possibly synchronising the actual pouring of all three foundations on the same day…….. Optimising the work of the crews is the key to a cost effective outcome and this depends on what follows their work.  For more on resource optimisation see: www.mosaicprojects.com.au/Resources_Papers_152.html. Advances in computer software offer the opportunity to develop a new way of working.

The starting point for the hypothesis outlined I this post is 4D BIM (Building Information Modelling). Last month I was in London working on the final edits to the second edition of the CIOB’s book, Guide to Good Practice in the Management of Time in Complex Projects (due for publication in 2017 as The Management of Time in Major Projects). One of the enhancements in the second edition is an increased focus on BIM. To assist our work a demonstration of cutting edge 4D BIM was provided Freeform.

Their current capabilities include:

  • The ability to model in real time clashes in working space provided the space needed for each crews work is parameterised. Change the timing of one work crew and the effect on others in a space is highlighted.
  • The ability to view the work from any position at any time in the construction process; allowing things such as a tower crane driver’s actual line of sight to be literally ‘seen’ at different stages of the construction.
  • The relatively normal ability to import schedule timings from a range of standard tools to animate the building of the model, and the ability to feedback information derived from processes such as the identification of clashes in the use of working space using
  • The space occupied by temporary works and various pieces of equipment can be defined and clashes with permanent works identified over time.
  • Finally the ability for a person to see and move around within the virtual model using the same type of 3D virtual reality goggles used by many gaming programmes. The wearer is literally immersed in the model.

For all of this in action on a major rail project see: https://www.newcivilengineer.com/future-tech/pushing-the-limits-of-bim/10012298.article

Moving into the world of game playing, there are many different games that allow players in competition, or collaboration, to ‘build’ cities, empires, fortifications, farms, etc. These games know the resources available to the players and how many resources will be required to construct each new element in the game – if you don’t have the resources, you can’t build the new asset.

Combining these two concepts opens up the possibility for a completely new approach to scheduling physical projects that involve the deployment of resources to physical locations to undertake work. The concept of location-based scheduling is not new, it was used in the 1930s to construct the Empire State Building (see: Line of Balance) and is still widely used.  For more on location-based scheduling see: Location-Based Management for Construction: Planning, Scheduling, and Control by Prof. Russell Kenley.

How these concepts tie into BIM starts with the model itself.  A BIM model consists of a series of parameterised objects. Each object can contain data on its size, weight, durability, cost, maintainability, carbon footprint, etc. As BIM develops many of these objects will come from standard libraries created by suppliers and subcontractors. Change an object, for example, replace windows from manufacturer “A” with similar Windows from manufacturer “B” and the model is update and potential issues with sizes, fixings and waterproofing can be identified. It is only a small step from this point to add parameters related to the resources needed to undertake the work of installation.

With this information and relatively minor enhancements to current BIM capabilities, once the engineering model is reasonably complete a whole new paradigm for planning work opens up.

4d-vr

To plan the work the ‘planning team’ put on their virtual reality headsets and literally ‘walk’ onto the site.  As they start to locate temporary works and begin the building process the model is tracking the use of resources and physical space in real time. The plan is developed based on the embedded parameters in the fully integrated 3D model.

Current 4D imports a schedule ‘shows you’ the effect.  Using the proposed gaming approach and parameterized objects you can literally build the project in the virtual space and either see the consequences on resource loading or be limited by resource availability.  A whole bunch of games do this already, add in existing clash detection capabilities (but applied to workers using the space) and you change the whole focus of planning a project. Decisions can be made to adjust the size of resource crews and the flow of work can be optimised to balance the competing objectives of cost efficiency, time efficiency and resource optimisation.

The proposed model is a paradigm shift away from CPM and its arbitrary determination of activities and durations to a process focused on the smooth flow of resources through work areas. The computational base will be focused on resource effectiveness and resource utilisation. Change ‘critical path’ to ‘critical resources’, eliminate the illusion of ‘float’ but look for underutilised resources and resource waiting time. To optimise the work, different scenarios can be stored, replayed and edited – the ultimate ‘what-if’ experience.

The concept of schedule density ties in with this approach nicely; initial planning is done for the whole project at the ‘low density’ level with activity durations of several weeks or months setting out the overall ‘time budget’ for the project and establishing the strategic flow of work.  As the design improves and more information becomes available, the schedule is enhanced first to ‘medium density’ and then to ‘high density’. The actual work is controlled by the ‘high density’ part of the schedule. For more on ‘schedule density’ see: www.mosaicprojects.com.au/WhitePapers/WP1016_Schedule_Density.pdf.

Where this concept gets really interesting is in the control of the work.  The medium and high density elements of the schedule are built using the same ‘virtual reality’ process as the overall schedule, therefore each object in the overall BIM model can include data on the resources allocated to the work, the sequence of work and the time allowed. Given workers on BIM-enabled projects already use various PDAs to access details of their work, the same tablet or smart device can be used to tell the workers their next job and how long that have to complete it. When they complete the task, updating the BIM model with that progress information updates the schedule, tells the crew their next job and tells the next resources planned to move into the area that the space is available. The schedule and the 3D model are the same entity.

Similarly, off-site manufacturing and design lead-times can be integrated into the dataset.  Each manufactured item can have its design, manufacture and transport and approval times associated with the element making the development of an off-site works / procurement schedule a simple process to extract the report once the schedule is set.  Identifying delays in the supply chain and dealing with changes in the timing of installation become staigtforward.

When inevitable problems occur, the project management team have the ideal tool to work through solutions and determine the optimum way forward, as soon as the new schedule is agreed, the BIM model already holds the information.

One of the key concepts in ‘schedule density’ is that any work planned for the short-term future has to be based on the actual performance of the crews doing the work. In a BIM enabled scheduling system this can also be automated. The work content of each activity is held in the model as is the crew assigned to the work. As soon as the work crew’s productivity can be measured, the benchmark values used in the original planning can be updated with real data. Where changes in performance are needed to deal with slippages and productivity issues these can be properly planned and incorporated into the schedule based on when the implemented changes can be expected to occur.

I’m not sure if this is BIM2 or BIM++ but these ideas are not very far in advance of current capabilities – all we need now is a software developer to take on the ideas and make them work.

These concepts will be harder to apply to ‘soft projects’ but the planning paradigms in soft projects have already been shaken up by Agile. But integrating 3D modelling with an integrated capability for real 4D interaction certainly seem to make sense for projects where the primary time management issue is the flow of resources in the correct sequence through a defined series of work locations in three dimensions.   What do you think???

New Planning and controls website

meeting1b

Our new project Planning and Controls website at www.planning-controls.com.au/ is now up and running.  This site currently has two focuses:

Helping people study to pass their PMI-SP® examination:  www.planning-controls.com.au/pmisp-courses/  Backed by a library of helpful PMI-SP exam support resources:  www.planning-controls.com.au/support/

Providing a single location for planners and schedulers to access our library of project controls papers and other free resourceswww.planning-controls.com.au/controls/   Almost all of the papers are available for download and use under the Creative Commons licence.

This site will be progressively updated with a view to becoming a key reference for all planning and control professionals worldwide!  Any suggestions for improvements will be appreciated – we look forward to hearing from you.

 

 

Critical confusion – when activities on the critical path don’t compute……

The definition of a schedule ‘critical path’ varies (see Defining the Critical Path), but the essence of all of the valid definitions is the ‘critical path’ determines the minimum time needed to complete the project and either by implication or overtly the definitions state that delaying an activity on the critical path will cause a delay to the completion of the project and accelerating an activity will (subject to float on other paths[1]) accelerate the completion of the project.

A series of blog posts by Miklos Hajdu, Research Fellow at Budapest University of Technology and Economics, published earlier this year highlights the error in this assumption and significantly enhances the basic information contained in my materials on ‘Links, Lags and Ladders’ and our current PMI-SP course notes.  The purpose of this post is to consolidate all these concepts into a single publication.

The best definition of a critical path is Critical Path: sequence of activities that determine the earliest possible completion date for the project or phase[2].  This definition is always correct.  Furthermore, in simple Precedence networks (PDM) that only use Finish-to-Start links, and traditional Activity-on-Arrow (ADM) networks the general assumption that increasing the duration of an activity on the critical path delays the completion of the schedule and reducing the duration of an activity on the critical path accelerates the completion of the schedule holds true.  The problems occur in PDM schedules using more sophisticated link types.  Miklos has defined five constructs using standard PDM links in which the normal assumption outlined above fails. These constructs, starting with the ‘normal critical’ that behaves as expected are shown diagrammatically below[3].

Normal Critical

The overall project duration responds as expected to a change in the activity duration.

1 Normal critical

A one day reduction of the duration of an activity on the critical path will shorten the project duration by one day, a one day increase will lengthen the project duration by one day.

Reverse Critical

The change in the overall project duration is the opposite of any change in the activity duration.

2 Reverse Critical

A one day reduction of the duration of Activity B will lengthen the project duration by one day, a one day increase will reduce the project duration by one day.

Neutral Critical

Either a day decrease or a day increase leaves the project duration unaffected. There are two variants, SS and FF:

3 Neutral 1

3 Neutral 2

In both cases it does not matter what change you make to Activity B, there is no change in the overall duration of the project.  This is one of the primary reasons almost every scheduling standard requires a link from a predecessor into the start of every activity and a link from the end of the activity to a successor.

Bi-critical Activities

Any change in the duration of Activity B will cause the project duration to increase.

4 Bi-critical

A one day reduction of the duration of Activity B will lengthen the project duration by one day, a one day increase will lengthen the project duration by one day.  Bi-critical activities depend on having a balanced ladder where all of the links and activities are critical in the baseline schedule. Increasing the duration of B pushes the completion of C through the FF link.  Reducing the duration of B ‘pulls’ the SS link back to a later time and therefore delays the start of C.  The same effect will occur if the ladder is unbalanced or there is some float across the whole ladder, it is just not as obvious and may not flow through to a delay depending on the float values and the extent of the change.

Increasing Normal Decreasing Neutral

An increase in Activity B will delay completion, but a reduction has no effect! There are two variations on this type of construct.

5 Increasing Normal Decreasing Neutral 1

5 Increasing Normal Decreasing Neutral 2

A one day increase in the duration of Activity B will increase the project duration by one day, however, reducing the length of Activity B has no effect on the project’s duration.

Increasing Neutral Decreasing Reverse

An increase in Activity B has no effect, but a reduction will delay completion! Again, there are two variations on this type of construct.

6 Increasing neutral decreasing reverse 1

6 Increasing neutral decreasing reverse 2

A one day increase in the duration of Activity B has no effect on the project’s duration, however, reducing the length of Activity B by one day will increase the project duration by one day.

Why does this matter?

The concept of the schedule model accurately reflecting the work of the project to support decision making during the course of the work and for the forensic assessment of claims after the project has completed, is central to the concepts of modern project management.  Apart from the ‘normal critical’ construct, all of the other constructs outlined above will produce wrong information or allow a claim to be dismissed based on the nuances of the model rather than the real effect.

Using most contemporary tools, all the planner can do is be aware of the issues and avoid creating the constructs that cause issues.  Medium term, there is a need to revisit the whole function of overlapping activities in a PDM network to allow overlapping and progressive feed to function efficiently.  This problem was solved in some of the old ADM scheduling tools, ICL VME PERT had a sophisticated ‘ladder’ construct[4].  Similar capabilities are available in some modern scheduling tools that have the capability to model a ‘Continuous precedence relationship[5]’ or implement RD-CPM[6].


[1] For more on the effect of ‘float’ see: http://www.mosaicprojects.com.au/PDF/Schedule_Float.pdf

[2] From ISO 21500 Guide to Project Management,

[3] The calculations for these constructs are on Miklos’s blog at: https://www.linkedin.com/in/miklos-hajdu-a1418862

[4] For more on ‘Links, Lags and Ladders’ see: http://www.mosaicprojects.com.au/PDF/Links_Lags_Ladders.pdf

[5] For more on continuous relationships see:  http://www.sciencedirect.com/science/article/pii/S1877705815031811

[6] For more on RD-CPM see: http://www.mosaicprojects.com.au/WhitePapers/WP1035_RD-CPM.pdf

The PM College of Scheduling Conference and Membership

The Project Management College of Scheduling is now officially open for business.   As you may already know, a group of us led by Jon Wickwire and Stu Ockman joined together to found the Project Management Institute College of Scheduling in early-2002.  A dozen years later, a new group (including me and many of the leaders of the former College) founded its successor, The Project Management College of Scheduling (PM-COS).   Subsequently, the PM-COS has completed the formalities necessary under USA law and is now officially open for business.

The role fulfilled by PM-COS is intended to be quite different to most member based organisations, focused on creating knowledge and capability in the scheduling profession.  As a member, you will:

  • Be a part of creating the centre of excellence for the advancement of scheduling and project controls throughout the world
  • Collaborate with other top schedule professionals, consultants and experts in identifying and instituting best practices on your projects
  • Help develop standards in all areas of scheduling including specifying, preparing, updating, software, claims, training and research
  • Provide education and training to promote accurate and ethical scheduling
  • Join in a dialog with software developers to foster implementations of new, innovative features in upcoming releases
  • Participate in mentoring the next generation of scheduling professionals

If sharing ideas and giving back to the profession get you excited and you’d like to be a part of our journey, why not Join Us now.  And, whether or not membership in the College is in your future, we’d love to have you with us at our annual conference, May 15th-18th in Chicago.

PM-COS16The Project Management College of Scheduling Annual International Conference, Scheduling the Future, will be held on the 15th to 18th May at the Hyatt Chicago Magnificent Mile.  This is a terrific opportunity to:

(1) share ideas,
(2) see old friends and make new ones and
(3) participate in this year’s premier planning and scheduling event.

We have a terrific technical program offering 14 Professional Development Units (PDU’s), with speakers and panel discussions planned to give everyone a chance to participate.  In addition, we have a social program with a Sunday night vendor reception, Monday night Gala Dinner and Tuesday night free for a night on the town.  We’re also planning a golf tournament Wednesday afternoon.

Don’t forget to check out the conference program, and drop by our website, http://www.pmcos.org/, to sign up now.  We’re offering a discount for PMCOS Members and another for early member-registration.  Finally, make your hotel reservations directly with the Hyatt Magnificent Mile at their website.  This may be the most important part since we’re visiting during peak season and the hotel has reserved a limited number of rooms for the conference.

We’ve got a lot planned, and you can help us make it a success!

Construction CPM -v- PGCS

We have just returned from a very enjoyable and successful trip to New Orleans for Construction CPM and now its time to focus on making our Project Governance and Controls Symposium (PGCS) in Canberra equally successful!

Construction CPM is probably the world leading event for project scheduling tools and advances in the field of major project scheduling. There were nearly 300 delegates, speakers and partners attending events over 7 days (the Construction CPM conference was 3 days in the middle).  The papers we presented were:

The emerging trends in New Orleans were firstly risk, new tools and many papers on the challenge of uncertainty and surprisingly ethics and stakeholders (more on these later).

Project Governance and Controls Symposium (PGCS) is designed to enhance the connection between governance and project controls in government department and corporations. It’s too soon to identify the trends that will emerge in May but we already have an impressive line up of Keynote Speakers. See more at: http://www.pgcs.org.au/

Both events have an emphasis on building knowledge through networking and social events.  However, the PGCS program, which includes a reception in the ADFA Officers Mess pales in comparison to Construction CPM.

Some of the things you will not see or experience in Canberra include:

Plated hot breakfasts starting at 6:30am with the first presentations at 8:00am (we run a more ‘civilised’ program starting around 9:00am……).

Our own Mardi Gras Parade……

NOL1NOL2

 

 

 

 

 

The Konstruction Krew consisting of 250+ project controls professionals following a jazz band (complete with police escort and waving umbrellas) in their own Mardi Gras Parade through the French Quarter to Bourbon Street.

Burbon-St

Last drinks and a locally rolled cigar at the Bourbon Heat from 9:00pm to 2:00am (if you have the staying power) When I bailed out at midnight, Bourbon Street was still going strong!!

Float

A totally different definition of ‘Float’ – several of the official Mardi Gras Parades – each organised by a different ‘Krew’ passed in front of our hotel in Canal Street.

CharmaineCharmaine Neville and her band playing inthe conference ‘Jazz Club’ from 9:00pm……..  PMOZ was renowned for its parties – Construction CPM is at least as good! In total there were 11520 ounces of alcohol consumed at the official events (plus cash purchases).

NOL3One final ‘only in New Orleans’ – ice cream daiquiris in the place they were invented……

Add  4 Keynote Speakers, 79 Breakout Sessions a mock trial, pre-arranged dinners with ‘5 new friends’ each evening and you have an intensive enjoyable learning experience.

The next Construction CPM is earlier then usual, December at the Swan Resort, Walt Disney World, Orlando Florida.

Our PGCS Symposium in Canberra will be a bit more subdued (after all there is only one ‘New Orleans’).  Where we will be as good, if not better, is in the quality of the speaking program.  PGCS speakers already confirmed include Lisa Wolf of Booze Hamilton Allen, Melinda Penna of Telstra, and Kim Terrell of Department of Human Services.  For regular updates on the progress of PGCS  see:  http://www.pgcs.org.au/