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project_management:big_bang_vs._incremental_approaches_for_the_development_of_a_new_shop [2021/04/08 23:35] – created Antonio Robirosa | project_management:big_bang_vs._incremental_approaches_for_the_development_of_a_new_shop [2021/04/08 23:45] (current) – Antonio Robirosa | ||
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====== Big band vs. incremental approaches for the development of a new shop ====== | ====== Big band vs. incremental approaches for the development of a new shop ====== | ||
- | I often get asked what approach I recommend for building a new **SAP Commerce** shop and both approaches may be the right one for your legacy shop. Since 2010 I can successes with both methods | + | I often get asked what approach I recommend for building a new **SAP Commerce** shop and both approaches may be the right one for your legacy shop. Since 2010 I saw successes with both methods. Here is criteria |
- | ^Criteria^Big bang aproach^Incremental migration to a new shop^ | + | ^Criteria^Big bang approach^Incremental migration to a new shop^ |
^Definition|A new shop is developed while the old one is on maintenance. One day the new shop goes live while the old one is turned off|Slowly one area is tackled, the requirements are defined, a **new component is developed** and when it goes live, it **replaces** the old one| | ^Definition|A new shop is developed while the old one is on maintenance. One day the new shop goes live while the old one is turned off|Slowly one area is tackled, the requirements are defined, a **new component is developed** and when it goes live, it **replaces** the old one| | ||
- | ^Must the business requirements and processes be clear before starting with the development? | ||
- | ^Total development effort (and time)|Less than the incremental approach because the programmers are writing new code without the need to support the old features|More than with a big ban approach because the shop is changed in small steps which must be compatible with the old components which aren't migrated| | ||
- | ^Risk of critical bugs which make the business lose money|High because it is difficult to be sure that the new shop will behave like the old one and contain all valuable features. This risk can be reduced by investing in testing the new code and in the parallel usage of the old and new shop|Low because the development team is focus in only one area at a time| | ||
- | ^Complexity of the deployment and go-live|Low: | ||
- | ^Posibility of introduction of new features during the development of the new shop|Limited. First the minimum viable set of features must be developed|High. Each new component may have new features| | ||
^When does the business sees the benefits of the new shop?|Late, after the new shop goes live|Early, after the first new component goes live| | ^When does the business sees the benefits of the new shop?|Late, after the new shop goes live|Early, after the first new component goes live| | ||
+ | ^Possibility of introduction of new features during the development of the new shop|Limited. First the minimum viable set of features must be developed|High. Each new component may have new features| | ||
+ | ^Must the business requirements and processes be clear before starting with the development? | ||
+ | ^Risk of critical bugs which make the business lose money|High because it is difficult to be sure that the new shop will behave like the old one and contains all valuable features. This risk can be reduced by investing in testing the new code and in the parallel usage of the old and new shop|Low because the development team focus in only one area at a time| | ||
+ | ^Total development effort (and time)|Less than the incremental approach because the programmers are writing new code without the need to support the old features|More than with a big bang approach because the shop is changed in small steps which must be compatible with the old components which aren't migrated| | ||
+ | ^Complexity of the deployment and go-live|Low: | ||
| | ||
===== Recommendations ===== | ===== Recommendations ===== | ||
==== Big bang development approach ==== | ==== Big bang development approach ==== | ||
- | It is essential that you **know the business | + | It is essential that you **know the business |
- | === Sucess | + | === Success |
- | In 2020 in **9 months** | + | In 2020 in **9 months** |
Although we found many critical bugs during the two days after the go-live, **after one week we reached our first record of orders placed on one single day.** And the business was extremely satisfied with the new shop. | Although we found many critical bugs during the two days after the go-live, **after one week we reached our first record of orders placed on one single day.** And the business was extremely satisfied with the new shop. | ||
==== Incremental replacement of the old shop ==== | ==== Incremental replacement of the old shop ==== | ||
- | Any other shop with complexity in the product catalogue, processes or contact catalogue must be slowly replaced by new code -one component at a time-. Usually this method is always | + | Any other shop with complexity in the product catalogue, processes or contact catalogue must be slowly replaced by new code -one component at a time-. Usually this method is used when most of the requirements aren't documented and they must be extracted from the legacy code. |
=== Success story === | === Success story === | ||
- | In 2018 2 full-stack developers and I replaced in 3 months the pricing calculation, | + | In 2018 2 full-stack developers and I as technical product owner replaced in **3 months** the pricing calculation, |
After the new system went live the business could change the prices in real-time and offer additional services for those products for a fee. | After the new system went live the business could change the prices in real-time and offer additional services for those products for a fee. | ||