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Success Case: JAMSS


Japan Manned Space Systems Corporation (JAMSS) is a company providing independent verification and validation (IV&V) services in the domain of mission-critical software systems. JAMSS supports, for instance, the Japan Aerospace Exploration Agency (JAXA) by developing, utilizing, and operating the Japanese module of the International Space Station (ISS). JAMSS requires a robust basis not only for planning independent verification and validation (IV&V) resources but also for monitoring software risks, negotiating project scope, and improving IV&V activities.

Yet, the estimation procedure based on experts’ judgment, which has been traditionally applied at JAMSS, did not provide such comprehensive support. CoBRA® was selected as offering a systematic way to achieve those objectives in the context of sparse measurement data (typical in a mission-critical software domain).

The CoBRA® technology was transferred to a JAMSS representative. First, a comprehensive CoBRA® tutorial was delivered, followed by a CoBRA® pilot application. An estimation model was developed to estimate the costs of reviewing the outputs of the requirements analysis development phase with respect to several IV&V objectives (e.g., risk analysis or design completeness).

The data from 5 already completed IV&V projects as well as the expertise of three domain experts were used as inputs for creating the effort estimation model.


Costs of introducing CoBRA® and model building

Involved personnel: 1 external CoBRA® consultant, 2 domain experts, 1 coordinator (one of the domain experts)
Duration: around 4 weeks
Effort per involved team member: CoBRA® tutorial: 16 person-hours (one domain expert involved)
CoBRA® pilot application:

Building CoBRA® model (3 domain experts): 4 person-hours per expert (meetings and interviews)

Coordination and support (one domain expert): 2 person-hours
Total effort (approx.): Building a CoBRA® effort estimation model: 12 person-hours
Learning, support & coordination: 18 person-hours

H. Nakao, A. Trendowicz, J. Münch
Estimating Effort of an Independent Verification and Validation in the Context of Mission-Critical Software Systems - A Case Study

Proceedings of the 20th International Conference on Software Engineering and Knowledge Engineering, Redwood City, San Francisco Bay, USA, 2008.