Tài liệu Project Management and Scrum – A Side by Side Comparison pdf

12/6/2006 Page 1 Project Management and Scrum – A Side by Side Comparison by Anne Loeser, October 2006 For decades, software development projects have followed the classic “waterfall” method in which software development initiatives were carefully analyzed, designed, documented, coded, tested, and ultimately delivered to the customer – sometimes years after inception. By then, it was not uncommon for business needs to have changed and for the resulting system to fall short of customers’ expectations. According to the Standish Group, software development projects have an overall success rate of 34%. In response to this rather disappointing approach to software development, “Agile” methodologies – which are light on documentation and formality - began to emerge in the 1990’s. Scrum, which is one of several Agile approaches, was first developed and presented in 1995 so it is relatively novel when compared with traditional software development processes which have been used for decades. The purpose of this paper is to compare traditional waterfall project standards and deliverables with those in Scrum, and to contrast the Project Manager’s role with that of the Scrum Master. Traditional Project Management at a Glance: According to the Project Management Body of Knowledge (PMBOK), a “project” is a temporary endeavor undertaken to create a unique product or service.” 1 Projects are typically divided into phases in order to provide better control of the project’s progress and deliverables; each phase has a prescribed set of deliverables. Collectively, the project phases are known as the “Project Lifecycle.” Project Management is a term encompassing the application of skills, tools, techniques, and knowledge applied to a project to meet or exceed stakeholder expectations. Project Managers typically oversee the following aspects of a project: 1. Project Scope, which ensures that all the required work, and only the required work, is planned, defined, documented, and delivered to the customer’s satisfaction. 2. Project Schedule, the objective of which is timely delivery of the product or service. It entails activity definition and estimating, and schedule development, monitoring and control. 3. Project Cost, which is intended to ensure that the project is delivered within its approved budget. It includes cost estimation and expense monitoring. 4. Project Quality, which encompasses quality definition, assurance, and control. 5. Project Communication for information dissemination and collection. 6. Project Risk including risk identification, quantification, avoidance, and mitigation. 7. Project Human Resources Management including but not limited to: • Organizational Planning – identifying, documenting and assigning project roles, responsibilities and reporting relationships. • Staff Acquisition – obtaining human resources for the project. • Team development – enhancing individual and group skills. Scrum at a Glance: Scrum is one of several Agile methods for developing and deploying software, although it may be used for non- software initiatives whenever people need to work together to achieve a common goal. The primary objective of Agile development is to deliver value early in the Project Lifecycle based upon customer and market 1 PMI Standards Committee, Project Management Body of Knowledge, Library of Congress Cataloguing-in-Publication data, 1996, page 10 12/6/2006 Page 2 demands. The ability to deliver value early and often, yet readily adapting to change, is considered to be a major contributor in making Agile Development one of the more rapidly growing trends in technology. Below is a list of Scrum characteristics in contrast with traditional waterfall attributes: • A dynamic Product Backlog of prioritized work to be done. Although not specifically mentioned in traditional project management above, this backlog may be loosely compared with traditional projects or smaller initiatives that are waiting to become active. Together with the Release Plan, the Product Backlog is jointly compiled by the busines Product Owner and the Development Team. • A Release Plan to deliver larger initiatives across multiple Sprints, with the highest priority first. The Release Plan is similar to the traditional Project Schedule in that it identifies product features and the corresponding timeframes (possibly phases) in which features will be delivered, albeit at a higher level than traditional Project Plans. Quality-related features, risks, dependencies, constraints, assumptions and issues may also be identified and documented as part of the Release Plan, which is generated by the Product Owner and Development Team. • A Sprint Planning Meeting in which backlog items are selected for iterations(s) called Sprints (which are usually 30 days in length). Product Owners and the Development Team finalize features and identify related tasks to be completed within the Sprint, and provide task estimates as part of planning. When applicable, the Release Plan will be referred to during the Sprint Planning Meeting. Risks and issues are also discussed at the Sprint Planning Meeting. The resulting Sprint consists of condensed Planning, Development, Testing and Release Project Lifecycle tasks and activities. • A living Sprint Backlog or Sprint Plan of tasks to be done within the Sprint. When tasks are identified in the Sprint Planning Meeting or during a Sprint, they are entered into the Sprint Backlog. The Sprint Backlog is related to the Project Scope mentioned above in traditional projects because it encompasses activities and deliverables that need to be completed within the Sprint. When a particular Sprint is part of a Release Plan encompassing multiple Sprints, its backlog may be compared to the deliverables within a traditional project phase. The product Owner and Development Team create the Sprint Backlog. • A brief daily Sprint Meeting or Scrum, at which each team member’s progress is disclosed, upcoming work is described and committed to, and impediments are raised. The Sprint Backlog is updated at the Sprint Meeting, and business partners are frequently members of the Scrum team. The daily meeting is the primary formal means of communication among the team, although informal meetings and other forms of communication throughout the day are encouraged. • A Demo at which Product Owners (and occasionally developers) demonstrate accomplishments during the Sprint. Each Sprint should deliver a usable product increment. The Demo has no equivalent in traditional projects. • A Retrospective, at which team members reflect about the past sprint and make recommendations about future improvements or changes. The Retrospective may be loosely compared with Post- Implementation Reviews in traditional projects. Scrum is facilitated by a Scrum Master whose primary responsibility is to remove obstacles hindering the team from delivering the Sprint goal. The Scrum Master is not the leader of the team because the Sprint team is self- organizing. Instead, the Scrum Master acts as a facilitator for issues resolution and communication, rather than as a manager controlling the team. The Scrum Master notes and removes obstacles, safeguards the Scrum process, facilitates collaboration, and acts as a “sheepdog” for the team. Whereas the Project Manager is held ultimately accountable for traditional projects, the entire Sprint team - including the Scrum Master - shares responsibility for consummating the Sprint’s objectives. Relatively little has been written about budget and cost control with respect to Scrum. Some corporations consider cost to be a factor when considering which features to include in a Sprint. Generally the organization itself is left to decide who will be in charge of monitoring the budget for a Scrum initiative. 12/6/2006 Page 3 Scrum utilizes an empirical approach. Unlike waterfall methodologies, Scrum accepts that a software initiative cannot be completely understood or fully defined up-front, and that requirements will change over time. Scrum’s purpose is to maximize the team's ability to respond in a responsive manner to change, and to produce a working product increment which is demonstrated to and accepted by the user in every Sprint. It is obvious that Scrum diverges from the approach to Project Management exemplified in the Project Management Body of Knowledge (PMBOK) - which has as its goal quality through application of a series of prescribed processes, documentation, and controls overseen by the Project Manager. In contrast, the Agile movement espouses that people and their interactions with each other are the key to creating value. According to the Digital Focus Agile 2006 Market Survey, which incorporates 136 executives across 128 organizations ranging in size from under 25 employees to over 5,000 employees, 46% of mid-size companies and 12% of large companies are using Agile practices company-wide. In the large company category, 44 percent are using Agile practices on one or more projects. 12/6/2006 Page 4 Project Management Comparison – Traditional and Scrum The following table provides a side-by-side comparison of Project Management practices and deliverables with respect to the traditional waterfall approach vs. Scrum. Project Management Practices and Deliverables: Traditional & Scrum ITEM TRADITIONAL WATERFALL SCRUM Processes Project Planning (Scope, Schedule, Communication, and Human Resources) . There is no equivalent of a Vision statement in waterfall projects, although a corporate Strategic Directive may be derived to specify direction and ultimately the projects that support it. . There is no specific equivalent of a Roadmap in waterfall projects, although companies may generate their own internal Strategic Plans in support of Strategic Directives. . Once a project has been justified and approved, the PM leads the requirements gathering and time estimation effort by holding extensive meetings with Business Analysts, designers, architects, IT, Product Owner(s) and key stakeholders. The PM oversees the creation of documentation-related deliverables such as Feasibility Studies, Statements of Work, Communication Plan, Contracts, Requirements Documents, etc. . The PM creates the Project Plan to derive a preliminary project schedule and subsequently baselines the plan after reviewing it with project team members and management. . The PM meets with the project team periodically (as specified within the Communication Plan) to update the Project Plan with actual hours and revised estimates, and to discuss risks and/or issues. The PM is chartered with documenting risks and issues and overseeing their successful closure. . Line Management decides upon project team resource allocations. The PM may negotiate with management at any time for resources if available resources are insufficient to deliver the project scope within the prescribed schedule. . The project is usually end date-driven and generally incorporates as many requirements as possible. 5 Levels of Planning: . Vision (a brief statement specifying direction) derived by Product Owner . Roadmap (a brief document consisting of 1 year’s worth of high level features) created by the Product Owner & Executives . Release Plan to deliver larger initiatives across multiple Sprints, compiled by the Product Owner and Development Team. The effort is usually facilitated by the Scrum Master. . A Sprint Plan identifying all tasks & estimated task hours is created by the Product Owner & Development Team – not by the Scrum Master. It is updated daily by the team at the Scrum meeting once the Sprint commences. Only estimated hours outstanding are tracked – actual hours are neither requested nor recorded. . Daily Sprint Meeting or Scrum. (15 min.) which is facilitated by the Scrum Master. This is the main means of ongoing team communication. The Scrum Master asks each team member what was committed to yesterday, what is being committed to today, and if there are any obstacles. The Scrum Master records obstacles and oversees their removal. The Sprint Plan is updated with estimated hours outstanding. . Line Management allocates Sprint resources. Negotiation prior to the beginning of the Sprint may or may not be possible, depending upon corporate adaptation of Scrum. Scrum team composition does not change during the course of the Sprint. . Project schedule is derived via the Release Plan if appropriate. Each Sprint is of fixed duration, and the highest priority items are delivered in the initial Sprint(s). 12/6/2006 Page 5 Monitoring Project Change Control and Risk – (Scope and Risk) . Changes to requirements are typically managed through a Change Control Process overseen by the Project Manager. Activities include, sizing, and obtaining management approval. . The Project Manager is responsible for Risk Analysis and Contingency Planning, and usually maintains and publishes a Risk Document. . Only the Sprint team can change features and tasks within a Sprint, and only if jointly agreed by all members of the Sprint Team. Otherwise the requested item is added to the Product Backlog. . The team performs risk management activities before starting development work. Risk may be discussed during Release, Sprint Planning, and/or daily Scrum Meetings. Task Ownership; Actuals/Estimates (Schedule and Human Resources) . The PM creates a Project Plan with tasks, assignments, and estimated hours. The Project Plan is reviewed with the Project Team and baselined once all parties concur. Deviations from the baseline must be explained and addressed by the PM. . The PM periodically updates the Project Plan with actual hours and new estimates, as well as with additional tasks based upon team input. . The PM acts as a coach and leader for the project team and assists team members in overcoming obstacles. . Team members create, sign up for, and estimate tasks in lieu of being assigned to tasks by the Scrum Master. There is no baselining in Scrum. . Team members may adjust estimated outstanding hours and add, transfer, or cancel tasks during the daily Sprint Meeting. Actual hours are not tracked – only hours outstanding. . The Scrum Master facilitates the team but typically does not coach or lead team members, who are considered self-managing. Project Overruns (Schedule) . If the completion date of the project or phase appears to be in jeopardy, the PM is responsible for negotiating one or more of the 5 following items: • Scope (reduction) • Schedule • Cost • Resources • Quality . Scrum promotes a fixed 30 day timeframe for deliverables. If it appears that a deliverable(s) may be delayed, the item(s) will be added to the Product Backlog and will most likely be carried forward to the next Sprint. The Sprint itself is never extended, nor does the Scrum Master negotiate for additional resources or time. Project Budget (Cost) . Typically, a project must provide ROI in order to be launched, at which point a Project Budget is derived. . The PM usually manages the Project Budget, which includes resource costs, technical costs, consultancy, departmental charge backs (if appropriate), and other expenses. Potential overruns must be justified and approved, and/or the PM must negotiate adjustments to the aforementioned 5 items in order to meet budget. . At the beginning of each Sprint, the Product Owner may be asked how much they want to spend on the Sprint. Based upon the answer, the team may use cost as a guideline when selecting an appropriate amount of work from the Product Backlog to be done in the Sprint. . No mention could be found in Scrum materials regarding Sprint-related budgets. It is assumed that each corporation adopts its own practices with respect to software development costs. Project Control – (Quality) . From the customer’s perspective, quality means on- time system delivery, to spec, and within budget and schedule. . Quality Management Plans and Checklists are often used to document and cross-check quality requirements. Although the PM might not be personally accountable for drafting these, s/he is responsible for ensuring that quality requirements and metrics are actualized by the project. . In waterfall projects, QA personnel typically . In Scrum, quality entails the delivery of a working product increment by the end of the Sprint in accordance with the specified feature(s). In cases where expense is a factor, cost constraints must be adhered to as well. . When applicable, quality-related features may be identified in Release and/or Sprint Planning Meetings, and they are built during the Sprint. As with any other feature, the entire Sprint team is accountable for providing the quality feature. . In Scrum, QA personnel may be needed for testing 12/6/2006 Page 6 become engaged in the testing phase. in every Sprint, which can create a resource burden on this group. Documents Cost Benefit Analysis . A Cost Benefit Analysis (CBA) may be submitted and approved in order for a project to be done. The PM may or may not be chartered with compiling this document. ROI is typically a key factor with respect to whether an initiative is approved for development. . The author could not locate a CBA equivalent in Scrum. Requirements . Related documents include but are not limited to: * Feasibility Study * Statement of Work * Project Scope *. Requirements Document * Functional Design * Detailed Design * Test Plans and Test Cases, which are sometimes done at the Requirements Definition Phase . The PM is generally chartered with overseeing that the necessary requirements-related documentation is compiled and approved. . In Scrum, there are 3 requirements-related items as described on page 2 of this document: * Product Backlog * Release Plan * Sprint Backlog/Plan . All three items are compiled by the Product Owner and Development Team, although the Scrum Master may facilitate the meetings. Change Control . PM is accountable for overseeing that changes to original project scope are documented, submitted, and approved. . Once a Sprint is underway, the entire team must concur upon a change before it is accepted. Other changes may be added to the Product Backlog at any time. Communication Plan . PM compiles and disseminates a Communictaion Plan depricting project communication-related deliverables (such as Team Meetings and Steering Committee Status Reports), specifying who will receive or be involved in them, and how often. . There is no equivalent to the Communication Plan in Scrum. Budget Spreadsheet . Generally the PM is accountable for overseeing and reporting the Project Budget. . The author could find no mention of Project Budget maintenance with specific respect to Scrum. Issues Log . The PM is accountable for compiling and updating the Issues Log and for overseeing that issues are resolved. . Issues/obstacles can be raised at any point, and the Scrum Master is responsible for documenting them, removing obsacles, and overseeing their closure. Risk Analysis . The PM is accountable for compiling and updating the Risk Analysis and Contingency Plan, and for navigating the team safely through the risks in order to deliver the project successfully. . Risks are documented by the Product Owner and Development Team in the Release Plan. The entire Sprint Team is responsible for resolving risks throughout the Sprint. Project Plan . The PM uses the Project Plan to derive the preliminary project schedule. The PM then baselines the schedule and meets periodically with the team to update the Project Plan with actual hours and revised estimates/tasks. . The Sprint Plan (tasks & hours per Sprint) is created by the Product Owner &Dev Team – not by the Scrum Master. It is updated daily by the team once the Sprint begins. Only estimated hours outstanding are tracked. The Sprint Plan is not baselined. Status Reports . The PM generates and delivers Project Status Reports as warranted. . Scrum does not specifically address project status reports. Scrum is generally light on documentation; it emphasizes personal interaction which would normally entail status-related information. Quality Management Plan; Checklists . Quality Management Plans and Checklists are often used to document and cross-check quality requirements. Although the PM might not be personally accountable for drafting these, s/he is responsible for ensuring that quality requirements and metrics are actualized by the project. . When applicable, quality-related features may be identified in Release and/or Sprint Planning Meetings and built during the Sprint. As with any other feature, the entire Sprint team is accountable for providing the tasks and activities to support quality-related items. Test Plans . Although the PM may not actually write test plans, the PM is responsible for ensuring that test plans are documented and successfully deployed. . Scrum acknowledges that a viable product increment must be delivered and accepted in a Sprint. It is up to the Product Owner to determine and ultimately test for viability within the Sprint. 12/6/2006 Page 7 Post- Implementation Support . The PM is responsible for ensuring that post- installation support is available to the product recipient. . A “stabilizing Sprint” may be planned for in the Release Plan and executed where appropriate. Team Meetings Steering Committee Status Meetings . For high-visibility, high-risk endeavors, the PM will set up and participate in regularly scheduled Steering Committee Meetings (as per the Communication Plan) at which the status of the project is discussed. . The author could find no mention of Steering Committee Meetings with respect to Scrum. Team Meetings . As per the Communictaion Plan, the PM will usually schedule regular team meetings to discuss progress, actuals/estimates, issues, and risk. Such meetings may last an hour or more. . In Scrum, the 15-minute daily Scrum meeting is the key vehicle for discussing progress, roadblocks, and upcoming commitments as well as obstacles. Post- Implementation Review . There is no equivalent to the Sprint Demo in traditional waterfall projects. . It is common for the PM to hold a Post Implementation Review with the Project Team at the end of the project in order to document what went well and what could be improved upon. . At the end of each Sprint, a Demo is held at which the product recipient demonstrates the usable product increment created during the Sprint. . A Retrospective is held, at which team members reflect about the past Sprint and make recommendations about future improvements or changes. The Scrum Master typically hosts the Retrospective. Recommendation, Conclusion, and Final Questions: As can be readily determined from the above, Scrum strongly advocates self-managing teams in which the Scrum Master acts primarily as a facilitator helping the team solidify its tasks as well as ‘running interference’ regarding any obstacles that may have a negative impact on team productivity. Self-managing teams require time to evolve; they do not happen overnight. Since Scrum documentation is relatively light on how to prepare a team to become self-sufficient, it is recommended that formal team-related coaching be provided prior to implementing Scrum. For seasoned Project Managers, the transition from leader to facilitator may be a difficult mindset to change, especially if the transition is fairly sudden. The traditional Project Manager may be compared with the captain of a ship who is chartered with steering the course, anticipating and overcoming difficulties, and ultimately safely delivering the cargo and passengers on schedule. In contrast, the Scrum Master acts mainly as an enabler to the Scrum Team since the entire team is responsible for the outcome of each Sprint. Whereas the Scrum Master primarily utilizes facilitation skills during the course of a Sprint, facilitation is a subset of the entire skill set required to be a successful PM. Experience and knowledge regarding requirements definition, time management, estimating, negotiating, budget oversight, and anticipating risk are all expected of the seasoned Project Manager. How these attributes may be best leveraged in Scrum - if at all - and to what extent the Scrum Master is free to tap into them is yet to be determined. Two final questions to pronder: 1 - Will the definition of Scrum Master evolve over the next decade to incorporate more traditional project management skills and approaches? Only time will tell, and the answer may depend upon how Scrum is adapted with regard to a company’s specific culture. 2 - Will seasoned Project Managers who become Scrum Master find themselves underutilized? If so, they will probably write a white paper as this author did. Anne Loeser can be reached at bestbird@hotmail.com. . more projects. 12/6/2006 Page 4 Project Management Comparison – Traditional and Scrum The following table provides a side- by -side comparison of Project. Project Management practices and deliverables with respect to the traditional waterfall approach vs. Scrum. Project Management Practices and Deliverables: