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RE.3.3.3 Technical Requirements (TReq)  

  Technische Anforderungen

Contents  
  • Introduction
  • Document Index
  • Document Structure
  • Introduction

    In this product, Technical Requirements for the overall System, the Segments and the SW Units/HW Units are defined. Along with these elements of the product structure, a corresponding functionality will be presented, and the technical requirements for interfaces, quality requirements and the technical requirements for the development and SWMM environment will be defined.

    Technical Requirements that could not be allocated to any element of the product structure are documented as general requirements.


    Document Index

    1. General Information
    2. General Requirements
    3. Technical Requirements for the Overall System
    4. Technical Requirements for SW Units/HW Units
          4.x.1. Identification of the Element
          4.x.2. Overall Function of Element
          4.x.3. Technical Requirements for the Interfaces
                4.x.3.1. Technical Requirements for the User Interface
                4.x.3.2. Technical Requirements for Other Interfaces
          4.x.4. Quality Requirements
                4.x.4.1. Criticality
                4.x.4.2. Technical Requirements for the IT Security
                4.x.4.3. Technical Requirements for Other Quality Characteristics
          4.x.5. Technical Requirements for the Development and SWMM Environment

    Document Structure

    1. General Information

    See schema 1. General Information.

    2. General Requirements

    This is a list of the technical requirements that could not be allocated to any element of the technical architecture.

    3. Technical Requirements for the Overall System

    Structure: see below

    4. Technical Requirements for SW Units/HW Units

    Structure per SW Unit/HW Unit: see below

    For each element x (= Segment or SW Unit/HW Unit) of the System Architecture the Technical Requirements must be specified as follows:

    4.x.1. Identification of the Element

    The considered architecture element is identified by means of the conventions defined in the CM Plan, and the corresponding long name is given.

    4.x.2. Overall Function of Element

    The functionality of the element is represented as a whole; in this connection, it is necessary to refer to the task of the element, to operating modes and to application fields.

    4.x.3. Technical Requirements for the Interfaces

    4.x.3.1. Technical Requirements for the User Interface

    In the case where the considered element has a direct user interface it will be described how it will be technically implemented. In the case of software interfaces, this might include the definition of masks, windows, and dialog sequences. In the case of hardware interfaces, this might include operating devices for adjustments, parameter settings, and data input. (Contrary to the User Requirements, this chapter does not define the information requirements, but the technical realization.)

    4.x.3.2. Technical Requirements for Other Interfaces

    The technical requirements for the interfaces of the considered element to other elements are defined. The identification of the interfaces and the corresponding partners result from the System Architecture.

    The refinement level of the description required here must chosen so it can be both starting point and decision base for the further development.

    4.x.4. Quality Requirements

    4.x.4.1. Criticality

    The criticality of the entire element is named and justified. The classification of the criticality level must be compatible with the criticality statements of the corresponding User Requirements.

    4.x.4.2. Technical Requirements for the IT Security

    The requirements for the IT security defined within the scope of the User Requirements are converted into technical requirements; they have to be defined in this chapter. (They might include: the requirement for mechanical protecting of floppy disk drives or the requirement for a way to prevent by means of software a new boot procedure by the user.)

    4.x.4.3. Technical Requirements for Other Quality Characteristics

    This chapter defines requirements with regard to The basis is /DIN ISO IEC 9126/.

    4.x.5. Technical Requirements for the Development and SWMM Environment

    This chapter is necessary for the overall System and for independently and separately developed elements.

    This chapter has to describe the requirements for the development, integration and test equipment that are connected with the considered element of the technical architecture during development and SWMM.

    In particular, the following requirements have to be defined:

    Notes:

    Relevant user-level requirements for higher structure levels have to be decomposed since they cannot be completely allocated to the element in question. Uncertain delimitations from other parts of the System Architecture must be avoided. The coverage of requirements should neither include overlaps (danger of double allocation and unclear interfaces) nor gaps.

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