Friends
My apologies if these parameters were discussed before. But can anyone help me understand these with some practical examples and at what stage of product realization process we specify those parameters ?
Appreciate all the help.Thanks
critical characteristic
A characteristic designated by the design authority, where the responsibility for its definition is outside the scope of this recommended practice. [9013]
Any feature throughout the life cycle of a critical item (e.g., dimension, tolerance, finish, material or assembly, manufacturing or inspection process, operation field maintenance, depot overhaul requirement) that if nonconforming, missing, or degraded may cause the failure or malfunction of the critical item. [9017]
key characteristic (KC)
An attribute or feature whose variation has a significant effect on product fit, form, function, performance, service life or producibility, that requires specific actions for the purpose of controlling variation. NOTE Special requirements and critical items are new terms and, along with key characteristics, are interrelated. Special requirements are identified when determining and reviewing requirements related to the product (see 7.2.1 and 7.2.2). Special requirements can require the identification of critical items. Design output (see 7.3.3) can include identification of critical items that require specific actions to ensure they are adequately managed. Some critical items will be further classified as key characteristics because their variation needs to be controlled. [9100][9110]
The definition in 9100, clause 3.4, applies with the following clarification for software. Key characteristics in software are those measurable attributes where variability can be measured by the project and can, if left unchecked, adversely impact the project or product in areas (e.g., schedule, cost, maintainability, testability, reliability, portability). Examples of key characteristics include defect severity, complexity factors, nested menus, memory, timing, response time, and throughput targets. [9115]
AS9100/EN-9100/JISQ 9100 definition: The features of a material or part whose variation has a significant influence on product fit, performance, service life, or manufacturability. This definition is further explained as follows:
? Key Characteristics for a part, subassembly or system are those selected geometrical, material properties, functional and/or cosmetic features, which are measurable, whose variation control is necessary in meeting Customer requirements and enhancing Customer Satisfaction.
? Key Characteristics for a process are those selected measurable parameters of a process whose control is essential to manage variation of part or system Key Characteristics.
? Substitute Key Characteristics may be identified when a Customer-defined Key Characteristic is not readily measurable within the production setting and other characteristics may need to be controlled to ensure conformance. [9103]
features of a material, process, or part whose variation has a significant influence on product fit, performance, service life, or manufacturability. (EN 9100)
NOTE 1: EN 9103 provides a standard for variation management of key characteristic. [IAQG-history]
Key characteristic owner is the person or function who defines the Key Characteristics and recognizes the reasons for the selection of the Key Characteristic. Typically, these responsibilities are held by Internal or External Customer Design, Quality or Manufacturing Engineering, and should be identified by a cross-functional team. [9103]
person or function who defines the key characteristics and recognizes the reasons for their selection. [IAQG-history]
Source: IAQG International Dictionary
