expert best practices

SofiaBulgaria

Summer School

Summer School IST-2001-34488 eXPERT:Best Practice on e-Project Development

http://www.esi.es/Expert

30 June - 2 July 2003

30 June - 2 July 2003

eXPERT Best practices

Boyan AngelovNemetschek

Penko IvanovRila Solutions

SofiaBulgaria

Summer School

Summer School IST-2001-34488 eXPERT:

Best Practice on e-Project Development http://www.esi.es/Expert

30 June - 2 July 2003

30 June - 2 July 2003


eXPERT in Nemetschek

Boyan Angelov

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Nemetschek OOD

The Pilot Project - Aims

Apply eXPERT in real life

project

Gather experience

Collect metrics

Evaluate the approach

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Nemetschek OOD

The Pilot Project - Scope

• Facility Management system

• Real life customer

• New technologies – Microsoft .NET

• Small team

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


eXPERT Application – Phases

Big BangProductive Phase

Evaluation Phase

Project Lifetime

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


eXPERT Application – Phase 1/3

Big Bang Initial Phase

• Execute all practices at once

• Apply strict control over practices application

• Evaluate practices

• Modify bottleneck practices

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003



Productive Phase

• Apply the approach

• Identify key practices

• Refine practices application

• Produce software

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003



Evaluation Phase

• Collect quantitative measures

• Evaluate approach

• Adjust approach

• Collect lessons learnt

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Big Bang phase Prerequisites

• About 2 months length

• The team has worked together on previous

projects

• The team never used XP or PSP before

• The team had 1 week eXPERT training

• The customer did not have any XP experience

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Big Bang phase - 2all or nothing

• Introduce all practices together – good or bad?

• Default practices

• Important practices

• Sequential application – what the sequence

should be?

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Big Bang phase - 3How to make the team do it?

• Developers – right, wrong or just afraid?

• Easily adopted practices

• Not so easily adopted practices

• Hard practices

• Total control over the application of the

practices

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Big Bang phase - 4Initial evaluation and adjustment

• Criteria for evaluation

• Practices that needed immediate adjustment

– Customer on-site

– Planning game

– Test first

• Enough fooling about

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Productive PhaseGet the best of it

• Benefit from the strong sides

– Identify and emphasize on the key practices

– Minimize documentation

• Minimize the effect of the weak sides

– Adjust practices that imply big overhead, but

preserve their benefits

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Productive Phase - 2Key Practices

• Which are they?

Small Releases

Simple Design

Refactoring

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Productive Phase - 3Adjust practices

• Which practices?

– Non-XP Customer – Planning game and Customer

On-site

– Unit testing

– Pair programming

– PSP PROBE method

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Evaluation PhaseCollect quantitative measures

• Why measure?

– eXPERT project requires it

– PSP requires it

– Increases developers discipline

– Provides constant status feedback to management

– Shows the practices that need adjustment

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Evaluation Phase - 2Collect quantitative measures

• What to measure?

– Code metrics – LOC, NOC, NOM, …

– Effort spent on tasks, processes, …

– Costs

– PSP PROBE method – effort per class, LOC, …

– Defects statistics – new, fixed, closed, …

– Unit tests – number of tests, failures, …

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Evaluation Phase - 3Collect quantitative measures

• How to measure?

– Automatic tools - code metrics, unit tests, bugs…

– Manual measurements – effort, PROBE, costs, …

• How often?

– Daily – effort on tasks, PROBE, …

– Weekly

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Evaluation Phase - 4Main results

• No schedule

deviation

• No costs deviation

• Low requirements

management risk

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Evaluation Phase - 5Main Results

Defect rates

NOWBEFORE

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003



Efforts per process

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003



Unit tests

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003



PSP PROBE methodCalculated hours per class type and size

very small small medium large very large

simple UI classes 0,3 0,8 2,0 4,8 11,5

property UI panel classes 1,0 2,2 4,7 10,3 22,5

multi UI panel components 1,4 4,3 13,2 40,9 126,6

model / data classes 1,7 3,0 5,2 9,1 15,8

business logic classes 3,1 5,2 8,9 15,2 25,8

utils/enum/interfaces/events/delegates 0,6 1,1 2,1 4,0 7,5

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Nemetschek Pilot ProjectTools used

• MS Visual Studio.NET – development IDE• MS Visual Source Safe – version tracking• Microsoft Project – effort and cost tracking• MS Excel, MS Word• Bugzilla – defect tracking• NUnit – unit testing• C# Refactory – code refactoring

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


NUnit

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


C# Refactory

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


Nemetschek Pilot ProjectLessons learned

• CR management can be easy• Design can be simple• Coding can be the biggest part of a project• Schedule can be kept• Unit testing improves quality• Estimation can be more precise, but can never be

exact• eXPERT is agile, lightweight and flexible• Documentation can be minimized

SofiaBulgaria

Summer School



30 June - 2 July 2003

30 June - 2 July 2003


For more information:

[email protected]@fmi.uni-sofia.bg

http://www.esi.es/Expert http://www-it.fmi.uni-sofia.bg/Expert

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