Michael,

Normally, you only have one agreed programme approved by the Engineer or Project Manager. This agreed programme is your contract or baseline programme. Then you monitor your performance by updating your programme on a weekly or monhtly basis and you compare your performance against your target (Baseline). The Engineer may require you to submit detailed short term programme like 3 or 4 weeks look ahead or 3 months look ahead but these programmes should be in line with the original baseline programme only in a more detailed format. Now, you need to monitor any variation by making a log of the changes or any deviaton from the original scope. Note that not all variation orders have impact on the programme, normally at some point in time you will ask for EOT especially if a variation has impacted the critical path or has delayed the project. Once the Engineer has granted you or the contractor an EOT, then that is the only time you need to re-baseline and incorporate the events which have impacted your programme.

You need to tell your site Engineers that they should report any works variations or any site instructions which deviates from the original scope of work. These works should be log, monitored and recorded in terms of the time and the resources used. Records are important for substantiation when making claims and this is basically how you monior and control variations.

Regards,

Daniel