Managing Complexity and Change with Scalable Software Design

MANAGING COMPLEXITY & CHANGE WITH SCALABLE SOFTWARE DESIGN Lodewijk Bergmans

Software engineering: a 3D balancing act

Plan of this talk ,[object Object],[object Object],[object Object],[object Object]

Challenges in software development ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

experience: complexity vs project risk source: Wallace, Keil & Rai, “Understanding software project risk: a cluster analysis”, Information & Management 42 (2004)

The only constant: Change Year maintenance costs (%) Definition Reference 2000 >90% sw.cost devoted to system maintenance & evolution / total sw. costs Erlikh (2000) 1993 75% sw. maintenance / IS budget (in Fortune 1000 companies) Eastwood (1993) 1990 >90% sw. cost devoted to system maintenance & evolution / total sw. costs Moad (1990) 1990 60-70% sw. maintenance / total MIS operating budgets Huff (1990) 1988 60-70% sw. maintenance / total MIS operating budgets Port (1988) 1984 65-75% Effort spent on sw. maintenance / total available SE effort. McKee (1984) 1981 >50% Staff time spent on maintenance / total time (in 487 organizations) Lientz & Swanson (1981) 1979 67% Maintenance costs / total sw. costs Zelkowitz et al. (1979)

proportional maintenance costs source: Banker et.al., “Software Complexity and Maintenance Costs”, CACM, Nov. 1993

Solution approach: scalable design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scalable design approach - technology ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scalable design approach - people ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],source: fact 28 in R. Glass., “Facts and Fallacies of Software Engineering”, Addison-Wesley 2003

Scalable design approach - value ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Software Complexity in an Industrial Case: ,[object Object],[object Object],[object Object]

Industrial case ,[object Object],[object Object],int get_kng(KNG_struct* KNG_ptr) { const char* func_name = "get_kng"; int result = OK; timing_handle timing_hdl = NULL; TIMING_IN; trace_in(mod_data.tr_handle, func_name); if (result == OK) { /* Retrieve current KNG */ *KNG_ptr = mod_data.KNG; } HE(result, "GET_KNG FAILED"); trace_out(mod_data.tr_handle, func_name, result); TIMING_OUT; return result; } primary functionality error handling

Industrial case: approach ,[object Object],[object Object],KNG_struct get_kng() { return ( mod_data.KNG); } note: ASML focused first on only one aspect

Industrial case: how to achieve this ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Improvement potential source: Walker Royce, “Improving Software Economics”: IBM white paper (2009) costs (per person year) 10-35% 5-10% <5% 200-1000% 25-100% 15-35% 5-25% impact (productivity) 25-50%

Conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],* source:a study by The Software Technology Support Center and The Mitre Corporation

questions/discussion items ,[object Object],[object Object],[object Object],[object Object],[object Object]

Applicability of scalable design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wat can you do? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scalable Design Paradox ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],source: fact 28 in R. Glass., “Facts and Fallacies of Software Engineering”, Addison-Wesley 2003

Managing Complexity and Change with Scalable Software Design

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