Muslah Systems Agile Development Process

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1 Muslah Systems, Inc. Agile Development Process 1 Muslah Systems Agile Development Process Iterative Development Cycles Doug Lahti December 7, 2009 October 5, 2010 In consideration of controllable systems development. We consider development of a large complex definition were the utopian solution is nearing completion. We refer to previous analysis regarding the Iterative Development Process, and consider the standardized publications, i.e. ISO 9000, CMMI, DO-178, SixSigma, and Agile. The objective is to define the development process flow to accomplish development of a large requirements set many parts. Obviously, to retain vagary is to avoid stipulation of the predominating solution, that is, the one solution that solves all development process flows. To be more specific, we describe a software system were the implementation evolves with iterative development cycles that result with reliable, maintainable, and correctly functioning. The standardized development process stipulate deliverables that include requirements, design, implementation, validation, and delivery. Other processes are corollary from the critical path that gives the most direct result. The quickest way is the fly by the seat of your pants approach; which usually ends with confusion, incomplete requirements satisfaction, and an unreliable product. Proper analysis, requirements resolution, architectural construction, and maintainable implementation are necessary activities that lead to a complete validation and delivery. As with DO-178, we wish to define methods, and techniques, to evaluate accurate prediction of failures. The extensions described by the CMMI overview are probably useful for very large projects. An application composed of 1M lines of coded, or larger, can be considered rather large for one person to develop. For the case of the lone programmer, yeah who persists to define shall find definition. The software system to consider for this text is presented in figure 1. Figure 1 presents the top-level software entities to compose a marketable product. Usually, a complex system has modal operations, configuration parameters, security issues, and user interfaces. Facility to observe system integrity, and correct functionality, are accomplished with appropriate trace and automated tests. These facility are often separate project tasks within the overall program. The development team assembles an application, the quality assurance group develop the trace mechanism, the systems group defines the configuration parameters, and Muslah Systems, Inc. Agile Development Process 1 / 7

2 Muslah Systems, Inc. Agile Development Process 2 Figure 1: Top Level Software System Security Configuration Application UI Trace management doesn't have enough time to spend on experiments. Methods to ensure successful outcome then become necessary to ensure satisfaction of an accurate product description. Implementation for each of these system entities are feasible. Software utility that provides all of these facility are available. An implementation that incorporates a unified integration have a more probable observation of efficient product development. Conceptually, each facility described thus far can be developed into separate library entities. The application becomes required to provide integration mechanisms for each. It is the desire of Muslah Systems to perceive the application as the minimal set that satisfy system environmental restrictions. Program size, and speed requirements, indicate optimization performance. An example for these concepts may be effective to explain further. Example 1 Figure 2 presents the block diagram for an application to accomplish data acquisition from a device input, and display data content to the user interface. The security module stipulates that only particular credentials are allowed to access the device, and thereby prevent the user interface from displaying any information. In this case, security is provided by the operating system. Mechanisms to prevent program execution are also available for alternate application requirements as well. The trace mechanism observes system integrity, and functional performance. Trace mechanisms access the applications memory space to retrieve indications that data propagates, and process flow is correct. The configuration parameters provide facility to change the operational attributes declaring the applications operational parameters. The user interface, like the trace mechanism, accesses the application data memory to retrieve the required information for display. Muslah Systems, Inc. Agile Development Process 2 / 7

3 Muslah Systems, Inc. Agile Development Process 3 The application development for this example is to assume that none of the system required interface definitions have been stipulated. At the time of this example development zero security modules, user interface packages, trace algorithms, or configuration tactics are available for immediate use. The objective for the application design is therefore to provide definition for these eventual integration requirements, while accomplishing the primary functionality defined for its implementation. An architecture that satisfies the top level issues of security, configurability, traceability, and operation are to be developed using an iterative approach that yields the Configuration Security Trace Device User Interface Application executable target in the least amount of time. This objective is considered optimal for proving reliable requirements satisfaction. The resource constrains to apply to this project are one developer and one development workstation that includes a compiler, debugger, and system utility for user interface generation and device access. Clearly, the developer is not going to develop the trace mechanism prior to definition of the application functionality. The objective to achieve a functional executable in the least amount of time indicates that the first version of this target executable will be incomplete. Having the program structure that supports all the system requirements initially will allow a more predictable schedule for integration of the implemented iteration. Scrutinizing evaluation of the underlying data patterns is a time consuming effort; yet resolution of these patterns are the starting point for architecting constructs that provide efficiently maintainable and manageable software sets. Resolution of data patterns representing optimal scope yields minimized aggregations, and inter-object collaborations. Some definitions (such as the MemoryManager) are highly collaborative, but these collaborations are contained withing the object definitions and are not observable with its public interface. Applications that ignore top-level requirements stipulating security issues, configurability, and observability, usually experience major re-factorization as these issues are resolved. These re-factorization efforts have a higher probability to require complex system oriented issue resolution. This probability occurs due to the fact that such a large portion of the overall set of software requires modification. Therefore, it is more appropriate to include architectural Muslah Systems, Inc. Agile Development Process 3 / 7

4 Muslah Systems, Inc. Agile Development Process 4 entities for these group of requirements even if the developer is not yet aware of the appropriate methods to implement. The concept to architect the final version prior to completion is driven by the thought that these software entities will be resolved as developments propagate. Notes, pseudo code, or actual source code, can be written when alternative solutions are resolved. These new developments may require re-factorization, but are more likely to have a lesser effect on the overall system. Because the system architecture implements place holders for this content, integration of these iterative developments will be elegantly executed. Example 2 A more appropriate example that represents iterative software system development is an editor application. Here we wish to license the target executable to prevent saving any edited display. The editor may function correctly, as designed, but if the product key is not correct, the result will not save to disk. The editor has some obvious configuration parameters: background color, foreground color, font, highlight color, etc. Traceability into the editor is required to evaluate system integrity, process flows, and resolve any system problem declared. The user interface sometimes become an integral component of the application, but for this example we wish to separate the user interface from the editor functionality, and stipulate that the user interface is a configurable entity as well. To make a user interface configurable, an abstraction of the user interface becomes necessary. We perceive the application as providing editor functionality to an arbitrarily chosen UI platform not being concerned with its detailed layout, attributes, or alternative views. This design restriction suggests that within the hierarchy of the top-level application, there exists implementation of the user interface abstraction that requires concrete implementation that is dynamically linked at runtime. The interim solution for this requirement may be to implement a default, and plan resolution for the dynamic replacement of the default. Later versions then my iterate to a startup condition for selecting the desired UI. If the user interface abstraction is not declared, and architected into the application within the first few development iterations of development, then the likelihood that the user interface modularity is probably low. Implementing the UI through an abstraction ensures that all future versions of the UI that satisfy the abstractions API will succeed. Therefore, a design requirement such as modular UI is best accommodated at the early stages of development, rather than the later. The examples discussed thus far introduce a design philosophy advocating an iterative development process. As described in [1], the development flows may iterate to modification of any development phase, but with the objective to minimize these iterations. The desired outcome is to represent a precisely accurate realization of the the system, i.e., all documents and validation processes span all requirements, and designed implementation. The iterative development flows may be defined using the following guidelines: Initial Product Description and Requirements attempt to encompass all desired functionality and restrictions. System Requirements and Architecture attempts to accommodate the complete Muslah Systems, Inc. Agile Development Process 4 / 7

5 Muslah Systems, Inc. Agile Development Process 5 product description with a skeleton application that has potential to evolve into its final product. Designed entities are implemented with the objective of reuse by a future product. Validation processes follow design implementation, and are an integral but yet independent entity from the application. Product deliveries may be interim as long as the validation process implemented for a partially complete product description are complete with regard to the design implemented. A functionally correct partial system implementation is always available for delivery, and is not updated until currently active iteration is complete. With these guidelines, we observe that each development iteration has potential to effect all development foundries. Completion of a design entity propagates to completion of a validation that indicates that a system requirement is resolved that satisfies the product description and becomes deliverable. Expertise associated with schedule development, and definition for the development iterations, improve with practice. Accuracy of schedule prediction becomes more likely. And everyone involved gains relief from stress, and can go home for a comforting diner with family, or enjoy their free time; which leads to more energetic enthusiasm to accomplish defined goals at work the next day. Criterion to use when definition for a development iteration vary with the implementations objective. To satisfy DO-178 expectation we consider failure conditions that describe compatibility with human welfare. System reboot, inappropriate data representation, potential for system process failures, recoverable conditions are aspects to consider for all developmental foundries. Methods to verify satisfaction of such requirements may be obscure at first, but will evolve to clear definition when the validation processes evolve to comprehensively complete. Some failures can not be avoided: external power failure, someone shoots me with a machine gun, etc. In this case we declare safe iterations that consider the following guidelines: One change at a time is easier to validate and 10 at a time, but 10 small changes may be more efficiently scheduled An iteration is not complete until it is validated A product is not DO-178 safe until the development processes for validation have been approved and declared compliant. It is the compliance to standardizations stipulated that have the greater risk associated with product completion. It is assumed that these standardizations are intended to ensure compliance to an object requirement (human welfare). As our ability to manage more complex system definition evolves, controversy associated with these standardized compliance issues may arise. Therefore, implementation of these evolutionary developments should probably demonstrate validity with systems not required to comply prior to convincing DO-178 peers. The issue of evolutionary complexity may be demonstrated with a prototype implementation, but not until some validation process can assure compliance. Then it Muslah Systems, Inc. Agile Development Process 5 / 7

6 Muslah Systems, Inc. Agile Development Process 6 become dependent on the competence of our peers with regard to a marketable product success. With consideration to efficient development of a utopian systems implementations, and restrictions stipulated by standardized institutionalization, Muslah Systems presents a set of milestone iterations associated with the development of an arbitrarily complex software system. These milestones are intended to represent essential developmental phases to completion of a product delivery. Each iteration declared involve all developmental foundries, i.e., Product Description, System Requirements, Design, Implementation, Validation, and Delivery. These iterations are titled as follows: 1. Product description with acceptable interim deliverables 2. Systems Requirements with anticipated architectural iterations 3. Skeletal Application binary/executable defining program structure, and top level entities 4. Design Documentation describing current implementation, and anticipated completions. 5. Skeletal Validation Process to accommodate and develop in parallel with design implementations. 6. Schedule Estimate to complete implementation 7. Program Review 8. Several Iterative implementations of skeletal hierarchy defined (includes developmental foundries) 9. Scheduled Program Reviews 10. Validation Report 11. Delivery Summaries, Project Performance Statistics, and Agile Performance Evaluation 12. Advanced Product Developments to repeat with step 1. Notice that the design document follow implementation of the product description as in step 3: a binary image is generated prior to its documentation. This ensures that the design document matches the implementation. For difficult algorithmic developments these two steps are paired as one step, and have potential for several iterations before a suitable coding convention is developed. Coding conventions are developed to maintain consistent understanding and appropriate usage. Some conventions such as multi-inheritance, use of pointer references, error handling, to name a few become controversial among software peers. Muslah Systems considers appropriate usage and implementation for all aspects of the coding language in use. Many product developments experienced reveal avoidance of the issues by restricting implementations from usage. The concept of polymorphism, virtual hierarchies, and distinctly independent usage require a verifiable observance. When the design philosophy can be observed to be correct, the convention used for design becomes a candidate for standardization of implemented products. Muslah Systems products are implemented using libmuslah, libnewmuslah, and the Muslah Systems, Inc. Agile Development Process 6 / 7

7 Muslah Systems, Inc. Agile Development Process 7 development platforms available. Unix, Linux, BSD, DOS, and MsWindows platforms are developing. Coding conventions described by design implementations have lead to suggested modification to compiler rules. These rules suggest a more compatible means for constructing complex objects, and system oriented issues associated with the C++ language: namely, virtual table construction and memory management. Some of libnewmuslah needs re-factorization, and other portions are not yet implemented. The development of these utilities, however, are proving to be useful for all aspects of a software system development described thus far. Development of the project coding convention was not included with the milestone list declared previously. Coding conventions are considered corollary to the development foundries. Coding conventions are used as a tool in association with the development platform in use. For a producer of software products, coding conventions are usually kept confidential, and considered trade secrets. For public application interface definitions, however, appropriate convention published usually stimulates appropriate usage. Coding conventions have been mentioned in this document to indicate vulnerability to the implementation schedule. A development team implementing consistent, and acceptable, coding convention have a greater probability to accomplish the developed schedule on time. Therefore, using the content provided, an Agile Development Plan specific to particular product development can be generated. Consideration for the corollary efforts associated with the development foundries can be included. This makes our simple 12 step list into a tree of tasks. These tree branches could evolve into a mesh of cooperative effort between project groups, i.e. development, validation, marketing, and systems groups all working together to ensure each others customer is satisfied. A well defined system is more likely to be understood by all as compared to a vaguely defined system. For future reference a design document that matches the implementation is most easily maintained. End of document. Muslah Systems, Inc. Agile Development Process 7 / 7

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