What is a critical problem? They often introduce problems in terms of the validity and reliability of the data. First, ask whether a metric is a valid measure of usability.
For example, the amount of time it takes to perform a task is often a usability goal—as in your example Six out of ten novice users shall perform task X in Y minutes. I would never buy this product. Such measures are invalid unless.
Let me give you some examples of what I mean. Is absolute time-on-task efficiency important? For systems that support repetitive, short tasks, it might be. In that case, you might want to include a metric for the time it takes to complete a typical core task.
By this, I mean that someone using the system is able to complete tasks correctly and completely—both simple tasks and those that are more complicated. This is more than learnability. It speaks to whether the system supports users in both understanding and completing goals—which might involve several software tasks.
Or is it used by employees who know how to do their jobs and just need the system to support their work? Your definitions of the users should be contextual, not general descriptions like novice. And remember, even people who use a system all the time are novices whenever they have to handle an unusual or difficult task.
You might want to set these values in comparison to metrics for the current system. I assume you want the new system to be at least as good as the old one—and hopefully, better. Kyle A 7 7 bronze badges. OZy OZy 53 1 1 silver badge 4 4 bronze badges. Possible duplicate of What is a Non-Functional Requirement? This question is about specific cases of something which either is or is not a non-functional requirement. The other question is asking for a definition of a non-functional requirement, and is answered with a bunch of examples, but no definition, nor criteria.
The other question won't be helpful to the OP. Add a comment. Active Oldest Votes. For instance, by telling that: Requirement See also Functional or non-functional requirement? Improve this answer.
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Go to my Linkedin profile. Home Templates Guidances Contact me. Usability engineering plan Write what you do, do what you write. The usability engineering plan describes the following topics: Input data review, Definition of use specification, Link with risk management, User interface specification, Formative evaluation protocol, Formative evaluation report, Design review s , Summative evaluation protocol, Summative evaluation report, Usability validation.
Usability input data Usability input data is a subset of design input data. Depending on the context of the project, they can contain: Statements of work, User requirements collected by sales personnel, product managers …, Data from previous projects, Feedback from users on previous versions of medical devices, Documentation on similar medical devices, Specific standards, like IEC Home use of electromedical devices, Regulatory requirements, like IFU or labeling.
Preparing the use specification The use specification is a high-level statement, which contains information necessary to identify: the user groups which are going to be subject of the usability engineering process, the use environment in which the device is going to be used, the medical indications which are needed to be explored further.
The use specification shall include the: Intended medical indication; Intended patient population; Intended part of the body or type of tissue applied to or interacted with; Intended user profiles; Use environment; and Operating principle. Preparing the use specification can make use of various methods, for example: Contextual enquiries in the user's workplace, Interview and survey techniques, Expert reviews, Advisory panel reviews.
This method is the simplest to implement once again if you can afford not to use other methods :- The use specification is recorded in the usability management file. Analysis The usability engineering process is performed in parallel to the ISO risk management process. Identifying characteristics for safety This step sounds clearly like risk management.
It consists in identifying: The primary operating functions in the device, The use scenarios, The possible use errors. Identifying hazardous phenomena and hazardous situations This step consists in identifying the hazardous phenomena and hazardous situations ditto.
They are identified with data coming from: The use specification, Data from comparable devices or previous generations of the device, User errors identified in the previous step. Identifying and describing hazard-related use scenarios This step is once again risk analysis: the hazardous phenomena, the sequence of events, and the hazards, resulting of the human factors are identified. Selecting hazards-related scenarios for summative evaluation It is not required to submit all hazard-related scenarios to the summative evaluation.
Identifying mitigation actions and documenting the user interface specification The risks related to the use scenarios are then evaluated according the risk management plan severity, frequency, and possibly detectability if you included that parameter in you risk management plan , and mitigation actions are identified, by following the risk management process. Design and Formative Evaluation The formative evaluation is performed during the design phase.
Summative evaluation The summative evaluation is performed at the end of the design phase. Application to agile methods The steps described above can be disseminated in the increments of an agile development process. Iterations and usability engineering The next steps of the usability engineering process are performed during iterations, as shown in the following diagram and explained in the next subsections.
Summative evaluation The summative evaluation is placed after the verification phase of the agile software development process. Conclusion I hope you have a better understanding on how to implement IEC in you software development process. Edit: Templates You will also find in the templates repository page , two templates useful to generate records of your usability engineering process: Usability Engineering File , Usability Summative Evaluation Plan and Report.
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