Feature interaction problem

Feature interaction is a software engineering concept. It occurs when the integration of two features would modify the behavior of one or both features.

The term feature is used to denote a unit of functionality of a software application. Similar to many concepts in computer science, the term can be used at different levels of abstraction. For example, the plain old telephone service (POTS) is a telephony application feature at one level, but itself is composed of originating features and terminating features. The originating features may in turn include the provide dial tone feature, digit collection feature and so on.

This definition of feature interaction allows one to focus on certain behavior of the interacting features such as how their response time may be changed given the integration. Many researchers in the field consider problems that arise due to change in the execution behavior of the interacting features. Under that context, the behavior of a feature is defined by its execution flow and output for a given input. In other words, the interaction changes the execution flow and output of the interacting features for a given input.

Example

In the context of telephony, a telephone line (the system) typically offers a set of features that include call forwarding and call waiting. Call waiting allows one call to be suspended while a second call is answered, while call forwarding enables a customer to specify a secondary phone number to which additional calls will be forwarded in the event that the customer is already using the phone.

To illustrate the example, we consider a telephone line provided to a customer, and we assume that both call forwarding and call waiting are enabled on the line. When a first call arrives on the line, the phone rings and is answered. Since neither feature is activated by the first call, there is no noticeable problem. When a second call arrives before the first has terminated, the telephone system has a decision to make: whether the call should be forwarded to the secondary number (call forwarding) or the person who answered the first call should be notified that another call has arrived (call waiting). Since this decision has no obvious correct answer, the optimal answer depends on the needs of the customer. This feature interaction is a specific example of a general and common problem that has become prevalent due to increasing system complexity.

In this situation, it is possible that the system’s decision will be made in a non-deterministic fashion due to race conditions and other design factors. The consequences of feature interactions can range from minor irritations to life-threatening software failures, and therefore there is ongoing research that aims to find ways of detecting as well as resolving feature interactions.

Workshops and conferences

The series of Feature Interaction Workshops (FIW) and the International Conferences on Feature Interaction (ICFI) are the primary venues devoted to this problem:

Event	Location	Co-chairs
FIW'92	St. Petersburg, USA	N. Griffeth, Y.-J. Lin
FIW'94	Amsterdam, The Netherlands	L.G. Bouma, H. Velthuijsen
FIW'95	Kyoto, Japan	K.E. Cheng, T. Ohta
FIW'97	Montreal, Canada	P. Dini, R. Boutaba, L. Logrippo
FIW'98	Lund, Sweden	K. Kimbler, L.G. Bouma
FIW'00	Glasgow, Scotland	M. Calder, E. Magill
FIW'03	Ottawa, Canada	D. Amyot, L. Logrippo
ICFI'05	Leicester, UK	S. Reiff-Marganiec, M. D. Ryan
ICFI'07	Grenoble, France	F. Ouabdesselam, L. du Bousquet
ICFI'09	Lisbon, Portugal	S. Reiff-Marganiec, M. Nakamura

gollark: I once wrote a 750-word essay on a poem which was 6 lines long.

gollark: A-level is hopefully going to be better, since I actually get to pick subjects I like and people who are bad at them won't be doing them.

gollark: Maths is good, though - my maths set has a really good teacher and we do (well, did when school was running) interesting and challenging stuff a lot of the time without repeating the same topic over and over again.

gollark: English is awful because we mostly overanalyze literature and write essays and stuff, but we did writing one time and that was fun.

gollark: A lot of the chemistry and physics stuff we do at school is... somewhat interesting at first, but we end up going over it again and again and doing endless worksheets for some reason, which is not very interesting.

External links

Research groups

Papers

FAQ Sheet on Feature Interaction, Pamela Zave.
Agents and their Services: An Ontological Approach to Feature Interaction B. Cohen, City University.
A Feature Interaction Benchmark for IN and Beyond E. Jane Cameron, Nancy D. Griffeth, Yow-Jian Lin, Margaret E. Nilson, William K. Schnure, Bellcore, and H. Velthuijsen, PTT Research, The Netherlands.
Conference proceedings of FIW and ICFI at IOS Press.
Feature interaction: a critical review and considered forecast. M. Calder, M. Kolberg, E. H. Magill, and S. Reiff-Marganiec. Computer Networks 41, pp. 115–141 (2002).
Feature Interaction as a Context Sharing Problem. Armstrong Nhlabatsi, Robin Laney, and Bashar Nuseibeh. International Conference on Feature Interactions, 11-12 June, University of Lisbon, Portugal, pp. 133-148 (2009).

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.